Podcast
Questions and Answers
Which of the following best describes the original vision of the Semantic Web?
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?
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?
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)?
What is the primary role of the Internet Engineering Task Force (IETF)?
What is meant by Postel's Robustness Principle concerning internet systems?
What is meant by Postel's Robustness Principle concerning internet systems?
What is the role of the Internet Corporation for Assigned Names and Numbers (ICANN)?
What is the role of the Internet Corporation for Assigned Names and Numbers (ICANN)?
Which of the following is a core function of the Domain Name System (DNS)?
Which of the following is a core function of the Domain Name System (DNS)?
According to Metcalfe's Law, what is the relationship between the value of a network and the number of its users?
According to Metcalfe's Law, what is the relationship between the value of a network and the number of its users?
What is the primary function of a Uniform Resource Identifier (URI)?
What is the primary function of a Uniform Resource Identifier (URI)?
In the context of URIs, what does the 'scheme' component specify?
In the context of URIs, what does the 'scheme' component specify?
Which of the following is an example of a valid URI?
Which of the following is an example of a valid URI?
What is the primary function of the Hypertext Transfer Protocol (HTTP)?
What is the primary function of the Hypertext Transfer Protocol (HTTP)?
What does it mean for HTTP to be a 'stateless' protocol?
What does it mean for HTTP to be a 'stateless' protocol?
What is the purpose of HTTP status codes?
What is the purpose of HTTP status codes?
Which HTTP method is typically used to retrieve (or read) a resource from a server?
Which HTTP method is typically used to retrieve (or read) a resource from a server?
What is the purpose of the 'Content-Type' header in an HTTP response?
What is the purpose of the 'Content-Type' header in an HTTP response?
What is 'content negotiation' in the context of HTTP?
What is 'content negotiation' in the context of HTTP?
Which organization is responsible for developing web standards?
Which organization is responsible for developing web standards?
What is the significance of moving 'Towards a Web of Data'?
What is the significance of moving 'Towards a Web of Data'?
How does the Semantic Web relate to the traditional World Wide Web?
How does the Semantic Web relate to the traditional World Wide Web?
Which of the following best describes the contribution of Vannevar Bush to the development of the web?
Which of the following best describes the contribution of Vannevar Bush to the development of the web?
What was one of the main goals behind the development of Doug Engelbart's oNLine System (NLS)?
What was one of the main goals behind the development of Doug Engelbart's oNLine System (NLS)?
What key concept was Ted Nelson hoping to realize with Project Xanadu?
What key concept was Ted Nelson hoping to realize with Project Xanadu?
What distinguishes the approach to Internet governance and standardization?
What distinguishes the approach to Internet governance and standardization?
What is the purpose of ‘Request for Comments’(RFC's)?
What is the purpose of ‘Request for Comments’(RFC's)?
What is the essence of Postel's law, also known as the Robustness Principle?
What is the essence of Postel's law, also known as the Robustness Principle?
Which statement accurately describes the role of the Internet Corporation for Assigned Names and Numbers(ICANN)
Which statement accurately describes the role of the Internet Corporation for Assigned Names and Numbers(ICANN)
What function does the Internet Assigned Numbers Authority(IANA) perform?
What function does the Internet Assigned Numbers Authority(IANA) perform?
According to Metcalfe's Law, how is the value or effect of a network determined?
According to Metcalfe's Law, how is the value or effect of a network determined?
In the context of the World Wide Web, what is identified by a Uniform Resource Identifier(URI)
In the context of the World Wide Web, what is identified by a Uniform Resource Identifier(URI)
Regarding the structure of URIs, identify the component that determines the protocol used to access the resource:
Regarding the structure of URIs, identify the component that determines the protocol used to access the resource:
What is the primary role of the Hypertext Transfer Protocol(HTTP) in web communications?
What is the primary role of the Hypertext Transfer Protocol(HTTP) in web communications?
What characterizes HTTP as a stateless protocol?
What characterizes HTTP as a stateless protocol?
When a client (such as a web browser) needs to 'retrieve' data from a server, which HTTP method is typically used?
When a client (such as a web browser) needs to 'retrieve' data from a server, which HTTP method is typically used?
What is the specific role of the Content-Type header in an HTTP response?
What is the specific role of the Content-Type header in an HTTP response?
Elaborate the purpose of content negotiation?
Elaborate the purpose of content negotiation?
Identify the central organization responsible for guiding the development and standardization of Web technologies.
Identify the central organization responsible for guiding the development and standardization of Web technologies.
In the transition 'Towards a Web of Data, what capability is most emphasized?
In the transition 'Towards a Web of Data, what capability is most emphasized?
Assess how the Semantic Web enriches the typical World Wide Web?
Assess how the Semantic Web enriches the typical World Wide Web?
What was Paul Otlet's primary contribution to information science?
What was Paul Otlet's primary contribution to information science?
What was Vannevar Bush's concept of the 'Memex' primarily designed to achieve?
What was Vannevar Bush's concept of the 'Memex' primarily designed to achieve?
What key features did Doug Engelbart's oNLine System (NLS) introduce to computing?
What key features did Doug Engelbart's oNLine System (NLS) introduce to computing?
What was the main objective behind Ted Nelson's Project Xanadu?
What was the main objective behind Ted Nelson's Project Xanadu?
Which of the protocols is a foundation of the World Wide Web, enabling the exchange of information between web servers and clients?
Which of the protocols is a foundation of the World Wide Web, enabling the exchange of information between web servers and clients?
What is the role of the Internet Assigned Numbers Authority (IANA)?
What is the role of the Internet Assigned Numbers Authority (IANA)?
Which statement reflects Postel's Robustness Principle in the design of internet systems?
Which statement reflects Postel's Robustness Principle in the design of internet systems?
How does the Domain Name System (DNS) contribute to the functionality of the Internet?
How does the Domain Name System (DNS) contribute to the functionality of the Internet?
According to Metcalfe's Law, how does the value of a network increase with the addition of new users?
According to Metcalfe's Law, how does the value of a network increase with the addition of new users?
Within the structure of a Uniform Resource Identifier (URI), what is the primary function of the 'scheme' component?
Within the structure of a Uniform Resource Identifier (URI), what is the primary function of the 'scheme' component?
Considering the stateless nature of HTTP, how do web applications typically manage user sessions?
Considering the stateless nature of HTTP, how do web applications typically manage user sessions?
What does an HTTP status code of '301 Moved Permanently' indicate to a client?
What does an HTTP status code of '301 Moved Permanently' indicate to a client?
Which HTTP header field is used by the server to indicate the media type of the resource being sent in the response body?
Which HTTP header field is used by the server to indicate the media type of the resource being sent in the response body?
In HTTP, what is the Accept header used for?
In HTTP, what is the Accept header used for?
Why is the World Wide Web Consortium (W3C) essential for the web's ongoing development?
Why is the World Wide Web Consortium (W3C) essential for the web's ongoing development?
In the context of the Semantic Web, what capability is primarily emphasized in the transition 'Towards a Web of Data'?
In the context of the Semantic Web, what capability is primarily emphasized in the transition 'Towards a Web of Data'?
How does the Semantic Web augment the functionality of the traditional World Wide Web?
How does the Semantic Web augment the functionality of the traditional World Wide Web?
What is a key characteristic of Internet architecture that promotes its widespread adoption and innovation?
What is a key characteristic of Internet architecture that promotes its widespread adoption and innovation?
What type of information is contained within a Request for Comments (RFC) document?
What type of information is contained within a Request for Comments (RFC) document?
Which of the activities falls under the responsibility of the Internet Corporation for Assigned Names and Numbers (ICANN)?
Which of the activities falls under the responsibility of the Internet Corporation for Assigned Names and Numbers (ICANN)?
How should Internet systems behave according to Postel's Law?
How should Internet systems behave according to Postel's Law?
What mathematical relationship describes Metcalfe's Law?
What mathematical relationship describes Metcalfe's Law?
Which component of a URI indicates the protocol used to access a resource?
Which component of a URI indicates the protocol used to access a resource?
What is the fundamental role of HTTP?
What is the fundamental role of HTTP?
How does HTTP's stateless nature impact web application development?
How does HTTP's stateless nature impact web application development?
Which HTTP method is designed to request data from a specified resource?
Which HTTP method is designed to request data from a specified resource?
Why is the Content-Type header important in HTTP responses?
Why is the Content-Type header important in HTTP responses?
What is the primary purpose of content negotiation in HTTP?
What is the primary purpose of content negotiation in HTTP?
What kind of role does the World Wide Web Consortium (W3C) take on in the evolution of web technologies?
What kind of role does the World Wide Web Consortium (W3C) take on in the evolution of web technologies?
What functionality is more emphasized by the 'Towards a Web of Data' vision?
What functionality is more emphasized by the 'Towards a Web of Data' vision?
How does the Semantic Web enrich the typical World Wide Web?
How does the Semantic Web enrich the typical World Wide Web?
What is the role of the IETF in the development and standardization of internet technologies?
What is the role of the IETF in the development and standardization of internet technologies?
What is the significance of the 'hierarchical part' within a URI structure?
What is the significance of the 'hierarchical part' within a URI structure?
In an HTTP request-response cycle, what role does content negotiation play?
In an HTTP request-response cycle, what role does content negotiation play?
How do architectural principles of web, outlined by W3C, influence the development of web technologies?
How do architectural principles of web, outlined by W3C, influence the development of web technologies?
In the context of the Semantic Web, what is an important distinction that must be made when identifying and naming resources?
In the context of the Semantic Web, what is an important distinction that must be made when identifying and naming resources?
Considering the architectural principles of the web, which of the following best describes how resources are identified and accessed?
Considering the architectural principles of the web, which of the following best describes how resources are identified and accessed?
To ensure interoperability and prevent vendor lock-in, how are internet and web standards typically developed and managed?
To ensure interoperability and prevent vendor lock-in, how are internet and web standards typically developed and managed?
In the context of HTTP, how does content negotiation enable a client to receive resources in the most suitable format?
In the context of HTTP, how does content negotiation enable a client to receive resources in the most suitable format?
When a client encounters a 301 Moved Permanently status code during an HTTP request, what does this signify?
When a client encounters a 301 Moved Permanently status code during an HTTP request, what does this signify?
Which of the following accurately describes the role of the World Wide Web Consortium (W3C) in the development of web technologies?
Which of the following accurately describes the role of the World Wide Web Consortium (W3C) in the development of web technologies?
Which of the following best represents the evolutionary sequence of information dissemination technologies leading up to the World Wide Web?
Which of the following best represents the evolutionary sequence of information dissemination technologies leading up to the World Wide Web?
Paul Otlet's vision of a 'Universal Book' primarily focused on:
Paul Otlet's vision of a 'Universal Book' primarily focused on:
Vannevar Bush's 'Memex' concept was most notably designed to:
Vannevar Bush's 'Memex' concept was most notably designed to:
Doug Engelbart's oNLine System (NLS) significantly influenced modern computing through the introduction of which key feature?
Doug Engelbart's oNLine System (NLS) significantly influenced modern computing through the introduction of which key feature?
Ted Nelson's Project Xanadu aimed to revolutionize information access by:
Ted Nelson's Project Xanadu aimed to revolutionize information access by:
The Internet Engineering Task Force (IETF) primarily contributes to the internet's functionality by:
The Internet Engineering Task Force (IETF) primarily contributes to the internet's functionality by:
Request for Comments (RFCs) are essential to internet standardization because they:
Request for Comments (RFCs) are essential to internet standardization because they:
Postel's Robustness Principle, 'Be conservative in what you do, be liberal in what you accept from others,' is primarily concerned with:
Postel's Robustness Principle, 'Be conservative in what you do, be liberal in what you accept from others,' is primarily concerned with:
The Internet Corporation for Assigned Names and Numbers (ICANN) is mainly responsible for:
The Internet Corporation for Assigned Names and Numbers (ICANN) is mainly responsible for:
The Internet Assigned Numbers Authority (IANA), a function of ICANN, is specifically tasked with:
The Internet Assigned Numbers Authority (IANA), a function of ICANN, is specifically tasked with:
Metcalfe's Law proposes that the value of a network:
Metcalfe's Law proposes that the value of a network:
In the context of web architecture, a 'resource' is best described as:
In the context of web architecture, a 'resource' is best described as:
A Uniform Resource Identifier (URI) serves primarily to:
A Uniform Resource Identifier (URI) serves primarily to:
Which component of a URI specifies the protocol to be used for accessing the resource?
Which component of a URI specifies the protocol to be used for accessing the resource?
The Hypertext Transfer Protocol (HTTP) is defined as a 'stateless' protocol because:
The Hypertext Transfer Protocol (HTTP) is defined as a 'stateless' protocol because:
In a typical HTTP request-response cycle, which HTTP method is used to request a resource from a server?
In a typical HTTP request-response cycle, which HTTP method is used to request a resource from a server?
HTTP status codes are used to:
HTTP status codes are used to:
The 'Content-Type' header in an HTTP response is crucial for:
The 'Content-Type' header in an HTTP response is crucial for:
HTTP content negotiation is a mechanism that allows:
HTTP content negotiation is a mechanism that allows:
The World Wide Web Consortium (W3C) is primarily responsible for:
The World Wide Web Consortium (W3C) is primarily responsible for:
The 'Towards a Web of Data' movement primarily aims to:
The 'Towards a Web of Data' movement primarily aims to:
How does the Semantic Web extend the capabilities of the traditional World Wide Web?
How does the Semantic Web extend the capabilities of the traditional World Wide Web?
Which of the following is a characteristic of internet architecture that has significantly contributed to its widespread adoption?
Which of the following is a characteristic of internet architecture that has significantly contributed to its widespread adoption?
What type of information is typically found in a Request for Comments (RFC) document?
What type of information is typically found in a Request for Comments (RFC) document?
Which activity falls under the responsibilities of the Internet Corporation for Assigned Names and Numbers (ICANN)?
Which activity falls under the responsibilities of the Internet Corporation for Assigned Names and Numbers (ICANN)?
According to Postel's Law, how should internet systems be designed in terms of sending and receiving data?
According to Postel's Law, how should internet systems be designed in terms of sending and receiving data?
What mathematical relationship describes Metcalfe's Law regarding network value?
What mathematical relationship describes Metcalfe's Law regarding network value?
In a URI, the 'scheme' component primarily indicates:
In a URI, the 'scheme' component primarily indicates:
What is the fundamental role of HTTP in the World Wide Web?
What is the fundamental role of HTTP in the World Wide Web?
Which HTTP method is specifically designed for requesting data from a specified resource without modifying it?
Which HTTP method is specifically designed for requesting data from a specified resource without modifying it?
Why is the 'Content-Type' header essential in HTTP responses?
Why is the 'Content-Type' header essential in HTTP responses?
What role does the World Wide Web Consortium (W3C) play in the evolution of web technologies?
What role does the World Wide Web Consortium (W3C) play in the evolution of web technologies?
In what way does the Semantic Web enrich the typical World Wide Web?
In what way does the Semantic Web enrich the typical World Wide Web?
Within a URI structure, what is the significance of the 'hierarchical part'?
Within a URI structure, what is the significance of the 'hierarchical part'?
In an HTTP request-response cycle, what is the role of content negotiation?
In an HTTP request-response cycle, what is the role of content negotiation?
How do the architectural principles of the web, as outlined by W3C, influence the development of web technologies?
How do the architectural principles of the web, as outlined by W3C, influence the development of web technologies?
In the context of the Semantic Web, what is an important distinction when identifying and naming resources?
In the context of the Semantic Web, what is an important distinction when identifying and naming resources?
Which of the following accurately distinguishes between hierarchical and network structures of information representation?
Which of the following accurately distinguishes between hierarchical and network structures of information representation?
How does decentralization influence the architecture of information systems like the Internet?
How does decentralization influence the architecture of information systems like the Internet?
In the context of the Semantic Web, what is the significance of distinguishing between a resource and an information resource?
In the context of the Semantic Web, what is the significance of distinguishing between a resource and an information resource?
When considering the architecture of the web, what role do URIs play in the identification and access of resources?
When considering the architecture of the web, what role do URIs play in the identification and access of resources?
What is the primary function of the Internet Engineering Task Force (IETF) regarding internet technology?
What is the primary function of the Internet Engineering Task Force (IETF) regarding internet technology?
In the context of Internet standards, why is the concept described in Postel's Robustness Principle considered important?
In the context of Internet standards, why is the concept described in Postel's Robustness Principle considered important?
What is the significance of the 'scheme' component within a Uniform Resource Identifier (URI)?
What is the significance of the 'scheme' component within a Uniform Resource Identifier (URI)?
How does the interaction between a user agent and a server exemplify the stateless nature of HTTP?
How does the interaction between a user agent and a server exemplify the stateless nature of HTTP?
How does the 'Content-Type' header field in an HTTP response impact how a user agent processes the response?
How does the 'Content-Type' header field in an HTTP response impact how a user agent processes the response?
How does content negotiation in HTTP facilitate a better user experience on the web?
How does content negotiation in HTTP facilitate a better user experience on the web?
What is the role of the World Wide Web Consortium (W3C) in the evolution of web technologies?
What is the role of the World Wide Web Consortium (W3C) in the evolution of web technologies?
How does the vision of 'Towards a Web of Data,' facilitated by semantic web technologies, enhance the traditional web?
How does the vision of 'Towards a Web of Data,' facilitated by semantic web technologies, enhance the traditional web?
What is a key goal of making data on the web more 'semantic'?
What is a key goal of making data on the web more 'semantic'?
Which of the following is a valid function of the Internet Assigned Numbers Authority (IANA)?
Which of the following is a valid function of the Internet Assigned Numbers Authority (IANA)?
Which statement illustrates the application of Postel's law in the design of networked systems?
Which statement illustrates the application of Postel's law in the design of networked systems?
What mathematical principle underlies Metcalfe's Law concerning the valuation of a network?
What mathematical principle underlies Metcalfe's Law concerning the valuation of a network?
In designing internet protocols, what guidance does Postel's Law offer?
In designing internet protocols, what guidance does Postel's Law offer?
How does the structure of a Uniform Resource Identifier (URI) ensure resources are uniquely and effectively addressed on the web?
How does the structure of a Uniform Resource Identifier (URI) ensure resources are uniquely and effectively addressed on the web?
What is the fundamental role of the Hypertext Transfer Protocol (HTTP) in web communication?
What is the fundamental role of the Hypertext Transfer Protocol (HTTP) in web communication?
Considering HTTP's characteristic as a stateless protocol, how do web applications typically manage user sessions?
Considering HTTP's characteristic as a stateless protocol, how do web applications typically manage user sessions?
What is indicated to a web client when a server returns an HTTP status code of '301 Moved Permanently'?
What is indicated to a web client when a server returns an HTTP status code of '301 Moved Permanently'?
In the context of HTTP, what is the role of the Accept header in content negotiation?
In the context of HTTP, what is the role of the Accept header in content negotiation?
What significance do architectural principles of web technologies have, as determined by W3C?
What significance do architectural principles of web technologies have, as determined by W3C?
In web architecture, how are resources typically identified and accessed to ensure a scalable and interoperable system?
In web architecture, how are resources typically identified and accessed to ensure a scalable and interoperable system?
How is vendor lock-in primarily prevented in the development and management of internet and web standards?
How is vendor lock-in primarily prevented in the development and management of internet and web standards?
During an HTTP request, if a client encounters a '301 Moved Permanently' status code, what action should the client take?
During an HTTP request, if a client encounters a '301 Moved Permanently' status code, what action should the client take?
When creating systems based on web architecture, what importance is placed on ensuring loose coupling between components?
When creating systems based on web architecture, what importance is placed on ensuring loose coupling between components?
What is the significance of distinguishing between the name of a thing (URI) and the thing itself (resource) in the Semantic Web?
What is the significance of distinguishing between the name of a thing (URI) and the thing itself (resource) in the Semantic Web?
What role do protocols play in enabling communication across the Internet?
What role do protocols play in enabling communication across the Internet?
How do standards organizations like the W3C contribute to the evolution of web technologies?
How do standards organizations like the W3C contribute to the evolution of web technologies?
How does Metcalfe’s Law explain the rapid adoption and expansion of social media platforms?
How does Metcalfe’s Law explain the rapid adoption and expansion of social media platforms?
What fundamental aspect of user agents allows users to access resources on the web?
What fundamental aspect of user agents allows users to access resources on the web?
What occurs during the process of content negotiation?
What occurs during the process of content negotiation?
What is the role that XML has in relation to attribute values?
What is the role that XML has in relation to attribute values?
From the perspective of a network, which of the below items is most dependent on the number of participants?
From the perspective of a network, which of the below items is most dependent on the number of participants?
In what classification would a URI of 'text/turtle'
fall?
In what classification would a URI of 'text/turtle'
fall?
Which of the following is a key aspect of facilitating machine processing of XML documents?
Which of the following is a key aspect of facilitating machine processing of XML documents?
Why is loose coupling between components important in the design of the web architecture?
Why is loose coupling between components important in the design of the web architecture?
An HTTP server sends some data, but the recipient fails to send the correct data based on the set content type. What happens?
An HTTP server sends some data, but the recipient fails to send the correct data based on the set content type. What happens?
What is the purpose of HTTP methods?
What is the purpose of HTTP methods?
Considering the architectural style of the World Wide Web, how does REST (Representational State Transfer) contribute to its functionality?
Considering the architectural style of the World Wide Web, how does REST (Representational State Transfer) contribute to its functionality?
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?
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?
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?
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?
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?
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?
Within the structure of a URI, which part is responsible for defining the protocol by which the resource should be accessed?
Within the structure of a URI, which part is responsible for defining the protocol by which the resource should be accessed?
Flashcards
Mundaneum
Mundaneum
A conceptual system for organizing and retrieving information, predating digital systems, which aimed to classify all knowledge. Paul Otlet's vision.
Memex
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
oNLine System- NLS
NLS was built by Doug Engelbart; included the mouse, word processing, data sharing, and hypertext. Stands for oNLine System
ARPANET
ARPANET
Signup and view all the flashcards
Project Xanadu
Project Xanadu
Signup and view all the flashcards
World Wide Web
World Wide Web
Signup and view all the flashcards
IETF
IETF
Signup and view all the flashcards
ICANN
ICANN
Signup and view all the flashcards
IANA
IANA
Signup and view all the flashcards
Metcalfe's Law
Metcalfe's Law
Signup and view all the flashcards
Resource
Resource
Signup and view all the flashcards
Uniform Resource Identifier (URI)
Uniform Resource Identifier (URI)
Signup and view all the flashcards
HTTP
HTTP
Signup and view all the flashcards
Hypertext Transfer Protocol (HTTP)
Hypertext Transfer Protocol (HTTP)
Signup and view all the flashcards
HTML
HTML
Signup and view all the flashcards
World Wide Web Consortium (W3C)
World Wide Web Consortium (W3C)
Signup and view all the flashcards
Hierarchical Structure
Hierarchical Structure
Signup and view all the flashcards
Network Structure
Network Structure
Signup and view all the flashcards
Decentralisation
Decentralisation
Signup and view all the flashcards
Request for Comments (RFC)
Request for Comments (RFC)
Signup and view all the flashcards
Postel's Law
Postel's Law
Signup and view all the flashcards
Domain Name System (DNS)
Domain Name System (DNS)
Signup and view all the flashcards
HTTP 1.1
HTTP 1.1
Signup and view all the flashcards
HTTP Start Line
HTTP Start Line
Signup and view all the flashcards
HTTP Header Fields
HTTP Header Fields
Signup and view all the flashcards
HTTP Message Body
HTTP Message Body
Signup and view all the flashcards
HTTP Methods
HTTP Methods
Signup and view all the flashcards
HTTP Status Codes
HTTP Status Codes
Signup and view all the flashcards
Content Negotiation
Content Negotiation
Signup and view all the flashcards
Extensible Markup Language (XML)
Extensible Markup Language (XML)
Signup and view all the flashcards
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
- http://example.com:8042/over/there?name=ferret#nose
- it has a Scheme, specifies type of URI
- Authority as hostname and optional port number
- Path as reference to content
- Query data not matching tree structure
- Fragment as addresses local part of document
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 .
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.