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title TARGET DECK FILE TAGS tags
Uniform Resource Identifiers Obsidian::STEM uri
uri

Overview

A uniform resource identifier (URI) is a unique sequence of characters for identifying some physical or abstract resource. URIs are further generalized to internationalized resource identifiers (IRIs) which allow using characters from any language, provided there exists a standard web encoding of the characters.

%%ANKI Basic What is URI an acronym for? Back: Uniform resource identifier. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic Why is a URI named the way it is? Back: It is a globally unique identifier for some resource. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic What is IRI an acronym for? Back: Internationalized resource identifier. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic In what way does an IRI generalize URIs? Back: It allows any characters with standard web encodings to be used in the identifier. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic Which of URIs or IRIs are more general? Back: IRIs. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

The URI generic syntax consists of five components organized hierarchically in order of decreasing significance from left to right:

<scheme>:[//<authority>]<path>[?<query>][#<fragment>]

where the <authority> is further composed as

[<userinfo>@]<host>[:<port>]

%%ANKI Cloze A URI has the following generic syntax:

{<scheme>}:{[//<authority>]}{<path>}{[?<query>]}{[#<fragment>]}. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Which two components of a URI are required? Back: The scheme and the path. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Which three components of a URI are optional? Back: The authority, query, and fragment. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic How many top-level components make up a URI's generic syntax? Back: Five. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic What is the associated delimiter of a URI's authority? Back: // Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic What is the associated delimiter of a URI's query? Back: ? Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic What is the associated delimiter of a URI's scheme? Back: N/A. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic What is the associated delimiter of a URI's fragment? Back: # Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic What is the associated delimiter of a URI's path? Back: N/A. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic When is a URI's component considered "undefined"? Back: When its associated delimiter is not present in the URI. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Which URI components are always defined? Back: The scheme and the path. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic What delimiter separates the segments of a path? Back: / Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what scheme? \text{http://www.example.com/questions/3456/my-document} Back: http Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what authority? \text{http://www.example.com/questions/3456/my-document} Back: //www.example.com Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what userinfo? \text{http://www.example.com/questions/3456/my-document} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what port? \text{http://www.example.com/questions/3456/my-document} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what host? \text{http://www.example.com/questions/3456/my-document} Back: www.example.com Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what path? \text{http://www.example.com/questions/3456/my-document} Back: /questions/3456/my-document Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what query? \text{http://www.example.com/questions/3456/my-document} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what fragment? \text{http://www.example.com/questions/3456/my-document} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Cloze The authority of a URI has the following generic syntax:

{[<userinfo>@]}{<host>}{[:<port>]} Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Which two components of a URI's authority is optional? Back: The user info and port. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Which component of a URI's authority is required? Back: The host. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what scheme? \text{ldap://[2001:db8::7]/c=GB?objectClass?one} Back: ldap Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what fragment? \text{ldap://[2001:db8::7]/c=GB?objectClass?one} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what authority? \text{ldap://[2001:db8::7]/c=GB?objectClass?one} Back: [2001:db8::7] Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what query? \text{ldap://[2001:db8::7]/c=GB?objectClass?one} Back: objectClass?one Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what path? \text{ldap://[2001:db8::7]/c=GB?objectClass?one} Back: /c=GB Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what scheme? \text{tel:+1-816-555-1212} Back: tel Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what authority? \text{tel:+1-816-555-1212} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what path? \text{tel:+1-816-555-1212} Back: +1-816-555-1212 Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what query? \text{tel:+1-816-555-1212} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what fragment? \text{tel:+1-816-555-1212} Back: N/A. It is undefined. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what scheme? \text{telnet://192.0.2.16:80/} Back: telnet Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what authority? \text{telnet://192.0.2.16:80/} Back: 192.0.2.16:80 Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic The following URI specifies what path? \text{telnet://192.0.2.16:80/} Back: / Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

URLs

A uniform resource locator (URL) is a URI that specifies the means of finding the represented resource. The most commonly used schemes are http and https.

%%ANKI Basic What is URL an acronym for? Back: Uniform resource locator. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic Why is a URL named the way it is? Back: Its structure specifies how to find the corresponding resource. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic How do you find the resource represented by a URI? Back: N/A. This isn't generally possible. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic In what way does a URI generalize URLs? Back: A URI does not necessarily specify how to find the represented resource. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic Which of URIs or URLs are more general? Back: URIs. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic Which of IRIs or URLs are more general? Back: IRIs. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic What scheme are URLs required to use? Back: N/A. There exist many possible schemes. Reference: “Uniform Resource Locator.” In Wikipedia, June 20, 2024. https://en.wikipedia.org/w/index.php?title=URL.

END%%

%%ANKI Basic What are the two most commonly used URL schemes? Back: http and https. Reference: “Uniform Resource Locator.” In Wikipedia, June 20, 2024. https://en.wikipedia.org/w/index.php?title=URL.

END%%

URNs

A uniform resource name (URN) is a URI that uses the urn scheme. It is intended to uniquely identify a resource, even when the resource no longer exists.

%%ANKI Basic What is URN an acronym for? Back: Uniform resource name. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Why is a URN named the way it is? Back: It is used to uniquely identify some resource. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Which of URLs or URNs are more general? Back: N/A. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Which of URNs or URIs are more general? Back: URIs. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Why aren't URLs a subset of URNs? Back: What a URL represents may change over time. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic Why aren't URNs a subset of URLs? Back: Their structure may not necessarily indicate how to find the resource. Reference: “Uniform Resource Identifier.” In Wikipedia, July 22, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Identifier.

END%%

%%ANKI Basic What scheme are URNs required to use? Back: urn Reference: “Uniform Resource Name.” In Wikipedia, April 26, 2024. https://en.wikipedia.org/w/index.php?title=Uniform_Resource_Name.

END%%

CURIEs

A compact URI (CURIE) is a denser representation of URIs. In its simplest form, it consists of a namespace and identifier separated by a colon. For example, geo:England.

%%ANKI Basic URIs in RDF are usually represented in what condensed format? Back: CURIEs. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic What is CURIE an acronym for? Back: Compact URIs. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic Consider CURIE geo:England. What is geo an example of? Back: A namespace. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic Consider CURIE geo:England. What is England an example of? Back: An identifier. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic In its simplest form, a CURIE is made up of what two parts? Back: A namespace and an identifier. Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

%%ANKI Basic The namespace and identifier of a CURIE is usually separated by what? Back: A colon (:). Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. Semantic Web for the Working Ontologist. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.

END%%

Bibliography