Web of Data: Vision, Internet, WWW

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Questions and Answers

Which of the following best describes the original vision of the Semantic Web?

  • A system for organizing and categorizing physical library books.
  • A web of data that enables machines to understand and process information, facilitating more intelligent applications. (correct)
  • A network where documents are linked together using hyperlinks, primarily for human navigation.
  • A platform for social networking and communication.

What was a key innovation introduced with the oNLine System (NLS) by Doug Engelbart?

  • The computer mouse. (correct)
  • The printing press.
  • The World Wide Web.
  • The telephone.

Which of the following figures is most closely associated with the concept of hypertext and the project Xanadu?

  • Tim Berners-Lee
  • Vannevar Bush
  • Doug Engelbart
  • Ted Nelson (correct)

What is the primary role of the Internet Engineering Task Force (IETF)?

<p>To develop and promote voluntary Internet standards. (C)</p> Signup and view all the answers

What is meant by Postel's Robustness Principle concerning internet systems?

<p>Systems should be flexible in what they accept but strict in what they send. (A)</p> Signup and view all the answers

What is the role of the Internet Corporation for Assigned Names and Numbers (ICANN)?

<p>It manages and coordinates the Domain Name System and IP addresses. (A)</p> Signup and view all the answers

Which of the following is a core function of the Domain Name System (DNS)?

<p>Translating domain names into IP addresses. (B)</p> Signup and view all the answers

According to Metcalfe's Law, what is the relationship between the value of a network and the number of its users?

<p>The value is proportional to the square of the number of users. (B)</p> Signup and view all the answers

What is the primary function of a Uniform Resource Identifier (URI)?

<p>To identify a resource on the internet. (C)</p> Signup and view all the answers

In the context of URIs, what does the 'scheme' component specify?

<p>The protocol used to access the resource. (B)</p> Signup and view all the answers

Which of the following is an example of a valid URI?

<p><a href="http://www.example.com/resource">http://www.example.com/resource</a> (A)</p> Signup and view all the answers

What is the primary function of the Hypertext Transfer Protocol (HTTP)?

<p>To transfer hypertext requests and responses between a client and a server. (A)</p> Signup and view all the answers

What does it mean for HTTP to be a 'stateless' protocol?

<p>Each request from a client to a server is treated as an independent transaction. (C)</p> Signup and view all the answers

What is the purpose of HTTP status codes?

<p>To indicate the success or failure of a request. (B)</p> Signup and view all the answers

Which HTTP method is typically used to retrieve (or read) a resource from a server?

<p>GET (C)</p> Signup and view all the answers

What is the purpose of the 'Content-Type' header in an HTTP response?

<p>To indicate the format of the message body. (A)</p> Signup and view all the answers

What is 'content negotiation' in the context of HTTP?

<p>A mechanism for selecting the best representation of a resource based on client preferences. (D)</p> Signup and view all the answers

Which organization is responsible for developing web standards?

<p>W3C (B)</p> Signup and view all the answers

What is the significance of moving 'Towards a Web of Data'?

<p>Creating a web where data is structured and interconnected, enabling machines to process information more effectively. (A)</p> Signup and view all the answers

How does the Semantic Web relate to the traditional World Wide Web?

<p>The Semantic Web is an extension of the World Wide Web, adding structured data and meaning to existing content. (A)</p> Signup and view all the answers

Which of the following best describes the contribution of Vannevar Bush to the development of the web?

<p>He conceived of the Memex, a hypothetical device that influenced the development of hypertext and personal knowledge management. (D)</p> Signup and view all the answers

What was one of the main goals behind the development of Doug Engelbart's oNLine System (NLS)?

<p>To augment human intellect and improve problem-solving capabilities. (D)</p> Signup and view all the answers

What key concept was Ted Nelson hoping to realize with Project Xanadu?

<p>A non-linear, hypertext-based system for organizing and linking information (D)</p> Signup and view all the answers

What distinguishes the approach to Internet governance and standardization?

<p>A decentralized, collaborative approach involving various stakeholders (C)</p> Signup and view all the answers

What is the purpose of ‘Request for Comments’(RFC's)?

<p>To serve as preliminary drafts for public commentary, influencing the development and adoption of internet standards (D)</p> Signup and view all the answers

What is the essence of Postel's law, also known as the Robustness Principle?

<p>Be strict in what you send to ensure compliance, but liberal in what you accept. (C)</p> Signup and view all the answers

Which statement accurately describes the role of the Internet Corporation for Assigned Names and Numbers(ICANN)

<p>ICANN manages and coordinates the system of domain names and IP addresses. (C)</p> Signup and view all the answers

What function does the Internet Assigned Numbers Authority(IANA) perform?

<p>Overseeing the assignment of IP addresses and domain names. (C)</p> Signup and view all the answers

According to Metcalfe's Law, how is the value or effect of a network determined?

<p>Proportional to the square of the number of users. (A)</p> Signup and view all the answers

In the context of the World Wide Web, what is identified by a Uniform Resource Identifier(URI)

<p>A unique address used to identify a resource, which may be a document,image,or service. (C)</p> Signup and view all the answers

Regarding the structure of URIs, identify the component that determines the protocol used to access the resource:

<p>Scheme (B)</p> Signup and view all the answers

What is the primary role of the Hypertext Transfer Protocol(HTTP) in web communications?

<p>Transmitting requests from web browsers to servers and delivering responses. (C)</p> Signup and view all the answers

What characterizes HTTP as a stateless protocol?

<p>Regards each client request as an independent transaction, without remmebering previous requests (D)</p> Signup and view all the answers

When a client (such as a web browser) needs to 'retrieve' data from a server, which HTTP method is typically used?

<p>GET (A)</p> Signup and view all the answers

What is the specific role of the Content-Type header in an HTTP response?

<p>Specifying the format of the data included in the body of the response (C)</p> Signup and view all the answers

Elaborate the purpose of content negotiation?

<p>Selecting the best representation of a specified resource (D)</p> Signup and view all the answers

Identify the central organization responsible for guiding the development and standardization of Web technologies.

<p>The World Wide Web Consortium(W3C) (B)</p> Signup and view all the answers

In the transition 'Towards a Web of Data, what capability is most emphasized?

<p>Empowering machine to process and integrate (D)</p> Signup and view all the answers

Assess how the Semantic Web enriches the typical World Wide Web?

<p>Facilitates semantic enrichment by allowing data to be readable for computers (A)</p> Signup and view all the answers

What was Paul Otlet's primary contribution to information science?

<p>He developed a system for classifying and linking all the world's knowledge. (D)</p> Signup and view all the answers

What was Vannevar Bush's concept of the 'Memex' primarily designed to achieve?

<p>To serve as a personal, searchable archive of information with associative linking. (A)</p> Signup and view all the answers

What key features did Doug Engelbart's oNLine System (NLS) introduce to computing?

<p>Graphical user interface, the mouse, and hypertext. (C)</p> Signup and view all the answers

What was the main objective behind Ted Nelson's Project Xanadu?

<p>To create a decentralized, non-hierarchical hypertext system with version control and royalty tracking. (D)</p> Signup and view all the answers

Which of the protocols is a foundation of the World Wide Web, enabling the exchange of information between web servers and clients?

<p>Hypertext Transfer Protocol (HTTP). (C)</p> Signup and view all the answers

What is the role of the Internet Assigned Numbers Authority (IANA)?

<p>Managing IP address allocation and domain name system. (C)</p> Signup and view all the answers

Which statement reflects Postel's Robustness Principle in the design of internet systems?

<p>Systems should be conservative in what they do, and liberal in what they accept from others. (D)</p> Signup and view all the answers

How does the Domain Name System (DNS) contribute to the functionality of the Internet?

<p>By translating human-readable domain names into IP addresses. (C)</p> Signup and view all the answers

According to Metcalfe's Law, how does the value of a network increase with the addition of new users?

<p>Quadratically, proportional to the square of the number of users. (D)</p> Signup and view all the answers

Within the structure of a Uniform Resource Identifier (URI), what is the primary function of the 'scheme' component?

<p>To determine the protocol used to access the resource. (D)</p> Signup and view all the answers

Considering the stateless nature of HTTP, how do web applications typically manage user sessions?

<p>By using cookies or session IDs to track user activity across multiple requests. (B)</p> Signup and view all the answers

What does an HTTP status code of '301 Moved Permanently' indicate to a client?

<p>The requested resource has been permanently moved to a new URI. (A)</p> Signup and view all the answers

Which HTTP header field is used by the server to indicate the media type of the resource being sent in the response body?

<p>Content-Type (C)</p> Signup and view all the answers

In HTTP, what is the Accept header used for?

<p>For the client to specify which content types it prefers to receive from the server. (C)</p> Signup and view all the answers

Why is the World Wide Web Consortium (W3C) essential for the web's ongoing development?

<p>It develops and promotes open web standards, ensuring interoperability. (B)</p> Signup and view all the answers

In the context of the Semantic Web, what capability is primarily emphasized in the transition 'Towards a Web of Data'?

<p>The ability of machines to understand and process the meaning of information. (A)</p> Signup and view all the answers

How does the Semantic Web augment the functionality of the traditional World Wide Web?

<p>By adding a layer of machine-readable metadata that describes the meaning of data. (B)</p> Signup and view all the answers

What is a key characteristic of Internet architecture that promotes its widespread adoption and innovation?

<p>Decentralized governance and standardization through consensus. (B)</p> Signup and view all the answers

What type of information is contained within a Request for Comments (RFC) document?

<p>Specifications for Internet protocols and technologies. (B)</p> Signup and view all the answers

Which of the activities falls under the responsibility of the Internet Corporation for Assigned Names and Numbers (ICANN)?

<p>Managing the allocation of IP addresses and domain names. (C)</p> Signup and view all the answers

How should Internet systems behave according to Postel's Law?

<p>Being flexible when receiving data from others, but precise in own data transmission. (B)</p> Signup and view all the answers

What mathematical relationship describes Metcalfe's Law?

<p>The value of a network is proportional to the square of the number of connected users. (C)</p> Signup and view all the answers

Which component of a URI indicates the protocol used to access a resource?

<p>Scheme (B)</p> Signup and view all the answers

What is the fundamental role of HTTP?

<p>To provide a standard way for web browsers and servers to communicate and exchange information. (D)</p> Signup and view all the answers

How does HTTP's stateless nature impact web application development?

<p>It requires developers to implement mechanisms like cookies or session tokens to maintain user context. (B)</p> Signup and view all the answers

Which HTTP method is designed to request data from a specified resource?

<p>GET (C)</p> Signup and view all the answers

Why is the Content-Type header important in HTTP responses?

<p>It tells the client how to interpret the data in the response body. (A)</p> Signup and view all the answers

What is the primary purpose of content negotiation in HTTP?

<p>To allow the server to provide the most suitable version of a resource to the client. (B)</p> Signup and view all the answers

What kind of role does the World Wide Web Consortium (W3C) take on in the evolution of web technologies?

<p>Creating standardized sets of rules for web technologies. (B)</p> Signup and view all the answers

What functionality is more emphasized by the 'Towards a Web of Data' vision?

<p>Ability of machines to interpret and interrelate information automatically. (A)</p> Signup and view all the answers

How does the Semantic Web enrich the typical World Wide Web?

<p>By superimposing a layer of machine-understandable data descriptions. (C)</p> Signup and view all the answers

What is the role of the IETF in the development and standardization of internet technologies?

<p>It serves as an organizational home to guide discussions for interested parties working on internet tech specifications. (D)</p> Signup and view all the answers

What is the significance of the 'hierarchical part' within a URI structure?

<p>It contains the authority and optional path to locate the resource on the server. (B)</p> Signup and view all the answers

In an HTTP request-response cycle, what role does content negotiation play?

<p>It enables the server to select and provide the best version of a resource based on the client's capabilities. (C)</p> Signup and view all the answers

How do architectural principles of web, outlined by W3C, influence the development of web technologies?

<p>By guiding the use of URIs and HTTP in order to maintain consistency and stability. (C)</p> Signup and view all the answers

In the context of the Semantic Web, what is an important distinction that must be made when identifying and naming resources?

<p>The distinction between the name (URI) and resource itself. (C)</p> Signup and view all the answers

Considering the architectural principles of the web, which of the following best describes how resources are identified and accessed?

<p>Resources are identified by URIs and accessed via a common protocol like HTTP. (C)</p> Signup and view all the answers

To ensure interoperability and prevent vendor lock-in, how are internet and web standards typically developed and managed?

<p>Through a decentralized, consensus-driven process involving various stakeholders. (D)</p> Signup and view all the answers

In the context of HTTP, how does content negotiation enable a client to receive resources in the most suitable format?

<p>It enables the client to specify preferred media types to the server, which then responds with the appropriate version. (A)</p> Signup and view all the answers

When a client encounters a 301 Moved Permanently status code during an HTTP request, what does this signify?

<p>The requested resource has been permanently moved to a new URI. (A)</p> Signup and view all the answers

Which of the following accurately describes the role of the World Wide Web Consortium (W3C) in the development of web technologies?

<p>It is a standards organization that develops specifications and guidelines for web technologies. (D)</p> Signup and view all the answers

Which of the following best represents the evolutionary sequence of information dissemination technologies leading up to the World Wide Web?

<p>Cave Drawings, Writing, Printing Press, Photography (D)</p> Signup and view all the answers

Paul Otlet's vision of a 'Universal Book' primarily focused on:

<p>Establishing a comprehensive and interconnected system of knowledge documentation. (D)</p> Signup and view all the answers

Vannevar Bush's 'Memex' concept was most notably designed to:

<p>Enhance individual human memory and information retrieval. (A)</p> Signup and view all the answers

Doug Engelbart's oNLine System (NLS) significantly influenced modern computing through the introduction of which key feature?

<p>The graphical user interface and the mouse. (C)</p> Signup and view all the answers

Ted Nelson's Project Xanadu aimed to revolutionize information access by:

<p>Developing a hypertext system with bidirectional links and micropayments. (B)</p> Signup and view all the answers

The Internet Engineering Task Force (IETF) primarily contributes to the internet's functionality by:

<p>Developing and standardizing internet protocols. (B)</p> Signup and view all the answers

Request for Comments (RFCs) are essential to internet standardization because they:

<p>Document proposed and ratified internet standards and protocols. (C)</p> Signup and view all the answers

Postel's Robustness Principle, 'Be conservative in what you do, be liberal in what you accept from others,' is primarily concerned with:

<p>Ensuring interoperability and resilience of internet systems. (B)</p> Signup and view all the answers

The Internet Corporation for Assigned Names and Numbers (ICANN) is mainly responsible for:

<p>Coordinating the Domain Name System, IP address allocation, and protocol identifiers. (C)</p> Signup and view all the answers

The Internet Assigned Numbers Authority (IANA), a function of ICANN, is specifically tasked with:

<p>Coordinating the allocation of IP addresses and managing the DNS root zone. (D)</p> Signup and view all the answers

Metcalfe's Law proposes that the value of a network:

<p>Increases proportionally to the square of the number of users. (B)</p> Signup and view all the answers

In the context of web architecture, a 'resource' is best described as:

<p>Any identifiable entity, abstract or concrete, on the web. (C)</p> Signup and view all the answers

A Uniform Resource Identifier (URI) serves primarily to:

<p>Identify a specific resource on the web. (C)</p> Signup and view all the answers

Which component of a URI specifies the protocol to be used for accessing the resource?

<p>The scheme. (D)</p> Signup and view all the answers

The Hypertext Transfer Protocol (HTTP) is defined as a 'stateless' protocol because:

<p>It does not maintain persistent connections between client and server. (B)</p> Signup and view all the answers

In a typical HTTP request-response cycle, which HTTP method is used to request a resource from a server?

<p>GET (A)</p> Signup and view all the answers

HTTP status codes are used to:

<p>Indicate the outcome of a request from the server to the client. (D)</p> Signup and view all the answers

The 'Content-Type' header in an HTTP response is crucial for:

<p>Informing the client about the media type of the response body. (D)</p> Signup and view all the answers

HTTP content negotiation is a mechanism that allows:

<p>Clients and servers to agree on the best format for content exchange. (D)</p> Signup and view all the answers

The World Wide Web Consortium (W3C) is primarily responsible for:

<p>Developing web standards and guidelines. (D)</p> Signup and view all the answers

The 'Towards a Web of Data' movement primarily aims to:

<p>Make web data more machine-readable and semantically rich. (B)</p> Signup and view all the answers

How does the Semantic Web extend the capabilities of the traditional World Wide Web?

<p>By adding a layer of machine-understandable metadata to web content. (C)</p> Signup and view all the answers

Which of the following is a characteristic of internet architecture that has significantly contributed to its widespread adoption?

<p>Decentralized and open architecture. (B)</p> Signup and view all the answers

What type of information is typically found in a Request for Comments (RFC) document?

<p>Technical specifications and standards for internet protocols and technologies. (D)</p> Signup and view all the answers

Which activity falls under the responsibilities of the Internet Corporation for Assigned Names and Numbers (ICANN)?

<p>Managing the Domain Name System (DNS) and IP address allocation. (D)</p> Signup and view all the answers

According to Postel's Law, how should internet systems be designed in terms of sending and receiving data?

<p>Strict in what they send and liberal in what they receive. (A)</p> Signup and view all the answers

What mathematical relationship describes Metcalfe's Law regarding network value?

<p>Quadratic: Value = k * N^2 (B)</p> Signup and view all the answers

In a URI, the 'scheme' component primarily indicates:

<p>The protocol used to access the resource. (D)</p> Signup and view all the answers

What is the fundamental role of HTTP in the World Wide Web?

<p>To enable the transfer of hypertext documents between web servers and clients. (B)</p> Signup and view all the answers

Which HTTP method is specifically designed for requesting data from a specified resource without modifying it?

<p>GET (C)</p> Signup and view all the answers

Why is the 'Content-Type' header essential in HTTP responses?

<p>To instruct the client on how to interpret the response body. (C)</p> Signup and view all the answers

What role does the World Wide Web Consortium (W3C) play in the evolution of web technologies?

<p>It leads the standardization and development of web technologies. (B)</p> Signup and view all the answers

In what way does the Semantic Web enrich the typical World Wide Web?

<p>By adding meaning and context to data, making it more useful for automated processing. (D)</p> Signup and view all the answers

Within a URI structure, what is the significance of the 'hierarchical part'?

<p>It contains the authority and optional path, often reflecting a server's file system structure. (D)</p> Signup and view all the answers

In an HTTP request-response cycle, what is the role of content negotiation?

<p>To allow the client and server to agree on the best format for the data being exchanged. (B)</p> Signup and view all the answers

How do the architectural principles of the web, as outlined by W3C, influence the development of web technologies?

<p>They provide guidelines to ensure interoperability, scalability, and decentralization. (D)</p> Signup and view all the answers

In the context of the Semantic Web, what is an important distinction when identifying and naming resources?

<p>Between information resources and non-information resources, and their respective URIs. (D)</p> Signup and view all the answers

Which of the following accurately distinguishes between hierarchical and network structures of information representation?

<p>Hierarchical structures organize information in a tree-like manner, while network structures emphasize interconnected nodes without strict levels. (A)</p> Signup and view all the answers

How does decentralization influence the architecture of information systems like the Internet?

<p>It promotes scalability and innovation by allowing independent development and deployment of technologies. (D)</p> Signup and view all the answers

In the context of the Semantic Web, what is the significance of distinguishing between a resource and an information resource?

<p>It helps in accurately describing and categorizing different entities, enabling precise data retrieval and reasoning. (A)</p> Signup and view all the answers

When considering the architecture of the web, what role do URIs play in the identification and access of resources?

<p>URIs act as a standardized naming system that enables the location and retrieval of resources over the Internet. (A)</p> Signup and view all the answers

What is the primary function of the Internet Engineering Task Force (IETF) regarding internet technology?

<p>To foster collaboration and develop standards for internet protocols and technologies. (A)</p> Signup and view all the answers

In the context of Internet standards, why is the concept described in Postel's Robustness Principle considered important?

<p>It promotes interoperability by advising systems to be lenient in what they accept and strict in what they send. (C)</p> Signup and view all the answers

What is the significance of the 'scheme' component within a Uniform Resource Identifier (URI)?

<p>It specifies the protocol to be used when accessing the resource. (B)</p> Signup and view all the answers

How does the interaction between a user agent and a server exemplify the stateless nature of HTTP?

<p>Each request from the user agent to the server is treated as an independent transaction, without knowledge from previous requests. (A)</p> Signup and view all the answers

How does the 'Content-Type' header field in an HTTP response impact how a user agent processes the response?

<p>It informs the user agent of the media type of the response body, enabling appropriate rendering or processing. (C)</p> Signup and view all the answers

How does content negotiation in HTTP facilitate a better user experience on the web?

<p>It enables clients and servers to agree on the most suitable format for content exchange. (D)</p> Signup and view all the answers

What is the role of the World Wide Web Consortium (W3C) in the evolution of web technologies?

<p>To develop and promote web standards, ensuring interoperability. (A)</p> Signup and view all the answers

How does the vision of 'Towards a Web of Data,' facilitated by semantic web technologies, enhance the traditional web?

<p>By enabling data to be understood and processed by machines, improving data integration and reasoning. (B)</p> Signup and view all the answers

What is a key goal of making data on the web more 'semantic'?

<p>To make data more easily understandable and processable by machines. (D)</p> Signup and view all the answers

Which of the following is a valid function of the Internet Assigned Numbers Authority (IANA)?

<p>Allocating IP addresses and managing the DNS root zone. (A)</p> Signup and view all the answers

Which statement illustrates the application of Postel's law in the design of networked systems?

<p>Designing systems to be flexible in accepting input while rigorous in their own output. (C)</p> Signup and view all the answers

What mathematical principle underlies Metcalfe's Law concerning the valuation of a network?

<p>The value increases exponentially with the number of users. (D)</p> Signup and view all the answers

In designing internet protocols, what guidance does Postel's Law offer?

<p>Be conservative in what you send and liberal in what you accept to ensure interoperability; focus on efficiency above all else. (B)</p> Signup and view all the answers

How does the structure of a Uniform Resource Identifier (URI) ensure resources are uniquely and effectively addressed on the web?

<p>By incorporating a hierarchical structure that includes the protocol, authority, and path to the resource. (B)</p> Signup and view all the answers

What is the fundamental role of the Hypertext Transfer Protocol (HTTP) in web communication?

<p>To facilitate the exchange of resources between web servers and clients using a request-response model. (D)</p> Signup and view all the answers

Considering HTTP's characteristic as a stateless protocol, how do web applications typically manage user sessions?

<p>By using mechanisms like cookies or session IDs to maintain context across requests. (B)</p> Signup and view all the answers

What is indicated to a web client when a server returns an HTTP status code of '301 Moved Permanently'?

<p>The requested resource has been permanently moved to a new URI. (B)</p> Signup and view all the answers

In the context of HTTP, what is the role of the Accept header in content negotiation?

<p>It enables the client to specify its preferred media types or formats for the response. (D)</p> Signup and view all the answers

What significance do architectural principles of web technologies have, as determined by W3C?

<p>They guide the development, interoperability, and evolution of web technologies. (D)</p> Signup and view all the answers

In web architecture, how are resources typically identified and accessed to ensure a scalable and interoperable system?

<p>Through Uniform Resource Identifiers (URIs). (E)</p> Signup and view all the answers

How is vendor lock-in primarily prevented in the development and management of internet and web standards?

<p>Through open development processes and consensus-based decision-making. (B)</p> Signup and view all the answers

During an HTTP request, if a client encounters a '301 Moved Permanently' status code, what action should the client take?

<p>Cache the response and redirect future requests to the new URL provided in the response. (D)</p> Signup and view all the answers

When creating systems based on web architecture, what importance is placed on ensuring loose coupling between components?

<p>It helps facilitate system adaptability and scalability. (B)</p> Signup and view all the answers

What is the significance of distinguishing between the name of a thing (URI) and the thing itself (resource) in the Semantic Web?

<p>It prevents confusion by recognizing that a URI identifies a resource but is not the resource itself. (B)</p> Signup and view all the answers

What role do protocols play in enabling communication across the Internet?

<p>They act as the agreed-upon rules for how data is transmitted and received. (B)</p> Signup and view all the answers

How do standards organizations like the W3C contribute to the evolution of web technologies?

<p>By developing standards for languages, protocols, and technologies, encouraging innovation and interoperability. (C)</p> Signup and view all the answers

How does Metcalfe’s Law explain the rapid adoption and expansion of social media platforms?

<p>The more individuals that choose to use a social media platform, the bigger the impact and value to those engaged. (B)</p> Signup and view all the answers

What fundamental aspect of user agents allows users to access resources on the web?

<p>They use particular links to enable users to navigate to other pages and to display additional information. (B)</p> Signup and view all the answers

What occurs during the process of content negotiation?

<p>The media type of messages is determined. (A)</p> Signup and view all the answers

What is the role that XML has in relation to attribute values?

<p>Attributes in XML can be used to reference URIs, but cannot apply the value to attributes. (E)</p> Signup and view all the answers

From the perspective of a network, which of the below items is most dependent on the number of participants?

<p>The value of a network. (B)</p> Signup and view all the answers

In what classification would a URI of 'text/turtle' fall?

<p>Content. (C)</p> Signup and view all the answers

Which of the following is a key aspect of facilitating machine processing of XML documents?

<p>They follow stricter syntactic rules. (C)</p> Signup and view all the answers

Why is loose coupling between components important in the design of the web architecture?

<p>To facilitate scalability and adaptability of the system. (F)</p> Signup and view all the answers

An HTTP server sends some data, but the recipient fails to send the correct data based on the set content type. What happens?

<p>The HTTP server may not be able to parse received bytes. (B)</p> Signup and view all the answers

What is the purpose of HTTP methods?

<p>So a user agent can communicate the purpose of its request to the server. (D)</p> Signup and view all the answers

Considering the architectural style of the World Wide Web, how does REST (Representational State Transfer) contribute to its functionality?

<p>By providing a theoretical foundation for web architecture principles, like statelessness and uniform interfaces. (C)</p> Signup and view all the answers

If a user agent sends a request to a server that results in a '303 See Other' HTTP status code, how should the user agent typically respond?

<p>By redirecting the user to a different URI, where the response to the request can be found. (B)</p> Signup and view all the answers

A user agent encounters a server that returns a 'Content-Location' header different from the originally requested URI. What does this typically indicate about the resource?

<p>The content is also available at the specified 'Content-Location', implying a mirrored or duplicated resource. (B)</p> Signup and view all the answers

When a client performs content negotiation with an HTTP server, which header is used to inform the server about the client's preferred media types?

<p>Accept (B)</p> Signup and view all the answers

Within the structure of a URI, which part is responsible for defining the protocol by which the resource should be accessed?

<p>The scheme (C)</p> Signup and view all the answers

Flashcards

Mundaneum

A conceptual system for organizing and retrieving information, predating digital systems, which aimed to classify all knowledge. Paul Otlet's vision.

Memex

A hypothetical electromechanical device described by Vannevar Bush in 1945, designed for information storage and retrieval, involving microfilm and associative linking.

oNLine System- NLS

NLS was built by Doug Engelbart; included the mouse, word processing, data sharing, and hypertext. Stands for oNLine System

ARPANET

A wide-area network created in 1969 connecting universities and research centers

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Project Xanadu

A hypertext project conceived by Ted Nelson aiming to create a non-hierarchical, bidirectional linking system for all information.

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World Wide Web

A system for organizing unstructured documents, developed by Tim Berners-Lee in 1989, based on hypertext and the internet.

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IETF

The Internet Engineering Task Force (IETF) is hosted at an organisation called the Internet Society. Specifications are called Request for Comments (RFCs).

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ICANN

A non-profit corporation responsible for Internet Protocol address space allocation, protocol identifier assignment, and domain name system management.

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IANA

IANA is a department of ICANN that coordinates the allocation of IP addresses and administers the Domain Name System (DNS)

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Metcalfe's Law

According to Metcalfe, the value of a network is proportional to the square of the number of users.

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Resource

Each resource is an abstract notion for things of discourse, be they abstract or concrete, physical or virtual.

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Uniform Resource Identifier (URI)

A compact sequence of characters that refers to an abstract or physical resource

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HTTP

Defines the set of request methods, status codes, and headers for message exchange

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Hypertext Transfer Protocol (HTTP)

A stateless application-level protocol for distributed, collaborative, hypertext information systems.

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HTML

Specifies the structure and semantics of documents, enabling browsers to display formatted text, images, and interactive elements

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World Wide Web Consortium (W3C)

An organization that develops web standards.

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Hierarchical Structure

The hierarchical organization of information that categorizes entities into parent-child relationships, like a file system.

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Network Structure

A non-linear method of organizing information where items are connected through links, allowing multiple relationships.

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Decentralisation

A design philosophy where governance and decision-making are distributed, rather than concentrated.

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Request for Comments (RFC)

A specification of an internet technology, providing methods, protocols, and concepts essential for network operations.

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Postel's Law

Internet systems should be strict in what they emit, but liberal in what they accept from others.

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Domain Name System (DNS)

A system for mapping hostnames to IP addresses in a hierarchical and distributed manner.

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HTTP 1.1

A specification (RFC 7230 and 7231) of message syntax, routing, semantics, and content structure for web communication

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HTTP Start Line

The starting line of HTTP messages contains request type, address, and protocol version.

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HTTP Header Fields

A part of HTTP messages which includes extra data in key-value format.

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HTTP Message Body

The HTTP component containing transferred content as bytes.

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HTTP Methods

Actions a client can perform on resources.

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HTTP Status Codes

Three-digit codes that indicate status of a HTTP request.

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Content Negotiation

When the user-agent expresses a preference for data format, language, or encoding.

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Extensible Markup Language (XML)

A document format with readable syntax for humans and machines.

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Study Notes

  • Lectures are held by Prof. Stefan Decker
  • Exercises are supervised by Laurenz Neumann
  • The slides are by Rezaul Karim, Sascha Welten, Lars Gleim
  • The lecture's license: Creative Commons Attribution 4.0 International
  • The slides are from the "Semantic Web Technologies" lecture at RWTH Aachen University
  • The slides are based on slides by Stefan Decker, Benedikt Köhler, Andreas Harth, and Lars Gleim
  • More information is available via: "http://lod-cloud.net"

Exercises information

  • Exercises are mandatory and contributes towards final grade
  • At least 50% of points are needed to qualify for the final exam
  • There will be 6 online, auto-graded exercises
  • Exercises (except for exercise 1) will be based on Jupyter notebooks
  • Notebooks can be opened via RWTH Jupyter Hub: https://jupyter.rwth-aachen.de
  • Study "Introduction to Jupyter Notebooks" for interaction between notebooks & Jupyter Hub
  • Further details will be provided in the first exercise session

Agenda

  • The Vision
  • The Internet
  • The World Wide Web
  • Towards a Web of Data

The Vision

  • Cave drawings are dated to 10000 BC
  • Sumerian Cuneiform writing is from 3200 BC
  • Gutenberg printing press invented in 1450
  • Photography was invented by Daguerre in 1839
  • Edison invented the Phonograph in 1877
  • Lumiere invented movies in 1895
  • Paul Otlet is relevant to the vision of the semantic web
  • Vannevar Bush helped advance the vision
  • Doug Engelbart helped promote and advance the vision
  • Ted Nelson helped push for more semantic meaning on the web

Paul Otlet

  • Hierarchical modeling for organizing data for universal use
  • Images describe structure of organizing data
  • He cataloged books in a universal bibliographic repertoire

Vannevar Bush

  • Published "As We May Think" in The Atlantic Monthly, July 1945
  • The Memex is "a device in which an individual stores all his books, records, and communications."
  • Tying two items together in the Memex is the important thing.

J.C.R. Licklider

  • J. C. R. Licklider wrote "Libraries of the Future" in 1965 .
  • There would be possibility to transfer chemical formulas directly from the general fund of knowledge to chemical process-control systems, without human reading and key pressing.

Doug Engelbart

  • Doug Engelbart created the oNLine System- NLS in 1968 at SRI.
  • "By 'augmenting human intellect' we mean increasing the capability of a man to approach a complex problem situation, to gain comprehension to suit his particular needs, and to derive solutions to problems."
  • NLS included the mouse, word processing, data sharing, and hypertext.

ARPANET

  • ARPANET was created by John Postel, David Crocker, and Vint Cerf in 1969.

Ted Nelson

  • Ted Nelson created Xanadu around 1960.
  • "Everything is deeply intertwingled."

WWW

  • Tim Berners-Lee invented the World Wide Web in 1989
  • "There was a second part of the dream [...] we could then use computers to help us analyse it, make sense of what we re doing, where we individually fit in, and how we can better work together."

The Internet

  • Vint Cerf and Bob Kahn are important for understanding current internet protocols and standards
  • Need for governance and standardisation due to the decentralized way internet advances.

Internet Engineering Task Force (IETF)

  • The IETF is hosted at the Internet Society.
  • The IETF provides a forum for interested parties to specify internet technology.
  • RFCs (Request for Comments) are specifications that describe a toolbox of protocols, methods and concepts that are essential for operating systems.
  • The IETF also published RFCs used as foundation of the WWW, these are Uniform Resource Identifiers (URIs) and Hypertext Transfer Protocol (HTTP).

Development Through RFCs

  • Standardization managed in fast developing surroundings with RFC's
  • Proposed specifications have categories like Informational, Best Current Practice, Standards Track
  • Standards Track is divided into Draft Standard, Proposed Standard, and Internet Standards
  • Internet Standards are specifications for which significant implementation and experience has been obtained

Jon Postel

  • Jon Postel (1943-1998) was a former RFC editor and Internet Hall of Fame Pioneer.
  • His Robustness Principle (RFC 793): "be conservative in what you do, be liberal in what you accept from others.“
  • Meaning: Internet systems should be strict in what they emit, but liberal in what they accept

Internet Corporation for Assigned Names and Numbers

  • The Internet Corporation for Assigned Names and Numbers (ICANN) is the main organisation that governs the internet.
  • ICANN is an internationally organised, non-profit corporation with responsibility for:
    • IP address space allocation
    • protocol identifier assignment
    • generic and country code top-level Domain Name System management
    • Root server system management functions

Internet Assigned Numbers Authority

  • The IANA is a department of ICANN that:
    • Coordinates the allocation of IP addresses
    • Administers the Domain Name System(DNS)
  • DNS is hierarchically organized to map hostnames to IP addresses

Examples of IETF Internet Standards

  • Internet Protocol (IP) – RFC 791 (Sept 1981) is responsible for sending packets to devices.
  • Transmission Control Protocol (TCP) – RFC 793 (Sept 1981) is responsible for breaking data into packets to fit IP.
  • Domain Names - Concepts and Facilities – RFC 1034 (Nov 1987) introduces the Domain Name System (DNS)

The Network Effect

  • Metcalfe's Law states that the cost of the network is proportional to the number of cards, but the value of the network is proportional to the square of the number of users

World Wide Web

  • the Web Architecture is key to building a better semantic web Web Architecture Group W3C is concerned with the principles of web architecture
  • Representational State Transfer (REST) provides the theoretical foundation for web architecture principles

Resource Definitions

  • A resource is "an abstract notion for things of discourse, be they abstract or concrete, physical or virtual".
  • examples: electronic documents, images, collections of other resources, chemical elements, numeric values, rooms
  • "files" are information resources while "directories" are collection resources
  • abstract concepts are “non-information Resources”

Uniform Resource Identifier (URI) Definition

  • A Uniform Resource Identifier (URI) is a character sequence that identifies a resource.
  • URIs are names for resources
  • URIs are defined in RFC 3986
  • URI's in Room sign at WU Vienna with HTTP allows users to view and book a room.

Structure of URIs

  • URIs have schema
  • generic URI syntax: scheme ":" hierarchical part[ "?" query ][ "#" fragment ]
  • hierarchical part contains the authority, headed by "//" and then an optional path

An HTTP URI example

Protocols

  • The networking infrastructure for global data exchange is the Internet
    • it is accessible over multiple different protocols
  • HTTP (Hypertext Transfer Protocol) is one that founds the World Wide Web,
  • Others include SMTP and FTP

Hypertext Transfer Protocol (HTTP)

  • On the web, communication between a user agent and a server is via HTTP
  • HTTP 1.1 is defined in a set of RFCs

HTTP 1.1 RFCs

  • RFC 7230: Message Syntax and Routing: basic structure of request and response, including basic header fields
  • RFC 7231: Semantics and Content: Request methods, status codes and additional header fields
  • RFC 7232: Conditional Requests
  • RFC 7233: Range Requests
  • RFC 7234: Caching
  • RFC 7235 Authentication
  • RFC 7230 and RFC 7231 are most relevant for this lecture

HTTP Standards

  • The Hypertext Transfer Protocol (HTTP) is a stateless application-level protocol for distributed, collaborative, hypertext information systems, RFC 7230 (Standard). -A user agent poses a request to a server, and a server issues a response to the user agent
  • User agents can be web browsers, household appliances, cars, or command line programs
  • Servers can be large-scale web servers, or household appliances, cars, that offer access to data or functionality

Successful HTTP Request/Response Interaction Steps

  • The user agent establishes a Transmission Control Protocol (TCP) connection with the server
  • The user agent transmits an HTTP request
    • A trailing newline indicates the end of message
  • THe Server then replies with an HTTP response
    • A trailing newline then indicates end of message closing it
  • The connection is terminated

Hypertext Transfer Protocol (HTTP)

  • HTTP is a stateless protocol where transactions treated independently by the server,
  • Two different requests must not imply same agent even on the same connection.
  • Permanent authentication is needed for staying logged-in or shopping baskets.
  • Session management achieved through HTTP authentication or Cookies

HTTP Request/Response Message Structure

  • Both requests take the same structure
  • Elements of the request
    • Start line
    • Headers
    • Message body
    • Start line is mandated
    • Other fields optional

More on HTTP Requests elements

  • Start line tells you request type i.e. GET /about.html HTTP/1.1
  • Headers provide specifics i.e. Host: demo.example.org, User Agent: curl/7.2.10
  • Message body is HTML Code to be transferred

HTTP Methods

  • The HTTP method is part of the request line
    • It tells the server about the agent's intention
  • There are several registered HTTP methods, but GET will be the focus in this course
HTTP Details
  • The message body bytes parsed with content type headers
  • The process of figuring out the media type of messages is content negotiation

HTTP Status Codes (RFC 7231)

  • Status codes are server messages to the user agent on success or failure
  • Returned at the start of a line.

Common HTTP Status Codes

  • Informational 1xx
  • Successful 2xx request received - understood
  • Redirection 3xx need more action by the agent request

HTTP details

-* The message body bytes parsed with content type headers -* The process of figuring out the media type of messages is content negotiation

HTTP Status Codes - Common Status Codes

  • 200 OK request was successful
  • 300 Multiple Choices indicates options
  • 301 Moved Permanently location has been designated
  • 303 See Other location available
  • 401 Unauthorized authentication issues
  • 404 Not Found resource was unfindable
  • 410 Gone resource at location is non existent
  • 500 Internal Server Error

Selected HTTP Header Fields

  • Use User-Agent for which requesting system
  • Name of the system is the User-Agent field.
  • Use Server for what responding system -Accept codes for agent specifying acceptable types -Location codes for where files on body reside.

HTTP Details

  • The message body bytes parsed with content type headers
  • The process of figuring out the media type of messages is content negotiation

Content Negotiation

-User-Agent usage

    • sends content type preferences -* (format, language, encodings,...)
    • Server: replies the location of the requested file -* Content-Location header
    • User: runs another HTTP request for file
The following content/media types
    • Any (Accept header)
    • HTML media type: text/html
    • XHTML media type: application/xhtml+xml
    • RDF/XML media type: application/rdf+xml
    • JSON-LD media type: application/ld+json
    • RDF Turtle media type: text/turtle
    • Notation3 media type: text/n3

HTML (Hypertext Markup Language)

  • Standard language to encode Hypertext
  • HTML 2.0 was specified as an IETF RFC in 1995.
  • HTML5 Was finalized within the W3C process, 3.2 came soon after

HTML Attributes

    • Important info:
    • Documents represented via headings and paragraphs Documents
    • Documents reference other Documents by (a href) tags
    • Documents include media or provide Form Actions.

HTML in Course

    • We Use HTML mainly for linking
    • User Agents are used for Navigation

Extensible Markup Language XML

  • More on markup languages readable to machines and Humans unlike HTML

  • XML documents structured via certain syntax -* Facilitaties processing of XML files -* XML attributes use URIs for identification, -. *XML became W3C recommendation

User Agents and Servers

Addressing protocol and format

    • User Agents can be PCs and Mac Browsers
    • browsers
    • Servers such as : HTTP, FTP, Gopher Servers

World Wide Web Consortium (W3C)

  • “The W3C is an international community where Member organizations, andThe
  • Public work together to develop Web standards.”
  • Vision to globally standardize web technology Runs by Tim Berners

World Wide Web Consortium W3C - Standards

  • *W3C Drafts and Recommendations,
    • maturities set the standards Working Draft (WD) Candidate Recommendation (CR) Proposed Recommendation (PR) W3C Recommendation
  • ***. Focus on what is in doc ###Lecture Learning Goals
  • *** Focus on characterstics -* Asses decentalisation and info in data architectures -*Explain network affects -*identify and name resources

Learning Goals

  • Distinguish between hierarchical structure and network structure in representing information Outline basic Internet and web technologies, and describe the relation between them: assess decentalisation.

The Semantic Web

-* the vision, the next step.

    • more learning will result in understanding its concepts and usage..
  • how Linked Data will stem from it
    • More advanced techniques w will change how web will look .

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