notebook/notes/ontology/rdf/index.md

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---
title: RDF
TARGET DECK: Obsidian::STEM
FILE TAGS: ontology::rdf
tags:
- ontology
- rdf
---
## Overview
The **Resource Description Framework** (RDF) is the foundational representation language of the Semantic Web. The basic building block of RDF is the **triple** containing a **subject**, **predicate**, and **object**. Global identifiers of resources are represented as [[uri|URIs]] (or, more generally, IRIs). These URIs can be expressed more compactly as [[uri#CURIEs|CURIEs]].
%%ANKI
Basic
Which organization standardized RDF?
Back: W3C
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.
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%%ANKI
Basic
What is W3C an acronym for?
Back: **W**orld **W**ide **W**eb **C**onsortium.
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.
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END%%
%%ANKI
Basic
What is RDF an acronym for?
Back: **R**esource **D**escription **F**ramework.
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.
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%%ANKI
Basic
What is considered the basic representation language of the Semantic Web?
Back: RDF.
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.
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%%ANKI
Cloze
With respect to RDF, a {resource} is {anything representable on the web}.
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.
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%%ANKI
Basic
What aggregate concept is considered the basic building block of RDF?
Back: The triple.
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.
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END%%
%%ANKI
Basic
What three components make up an RDF triple?
Back: The subject, predicate, and object.
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.
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END%%
%%ANKI
Cloze
In RDF, a triple is a ({subject}, {predicate}, {object}) tuple.
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.
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END%%
%%ANKI
Cloze
A {subject} is to a semantic triple as a row number is to a relation record.
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.
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END%%
%%ANKI
Cloze
A {predicate} is to a semantic triple as an attribute is to a relation record.
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.
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END%%
%%ANKI
Cloze
An {object} is to a semantic triple as a value is to a relation record.
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.
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END%%
%%ANKI
Basic
Consider converting the following table to a triple. What is the subject?
![[triple-table-repr.png]]
Back: Row 2
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.
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END%%
%%ANKI
Basic
Consider converting the following table to a triple. What is the object?
![[triple-table-repr.png]]
Back: Hamlet
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.
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END%%
%%ANKI
Basic
Consider converting the following table to a triple. What is the predicate?
![[triple-table-repr.png]]
Back: Title
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.
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END%%
%%ANKI
Basic
RDF identifiers use what encoding?
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.
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## Standard Namespaces
W3C have defined a number of standard namespaces for use with Web technologies:
* `xsd`
* Refers to the XML schema definition.
* `xmlns`
* Refers to XML namespaces.
* `rdf`
* Refers to identifiers used in RDF.
%%ANKI
Basic
What is the standard `xsd` namespace an acronym for?
Back: **X**ML **S**chema **D**efinition.
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.
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END%%
%%ANKI
Basic
What is the standard `xmlns` namespace an acronym for?
Back: **XML** **N**ame**s**pace.
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.
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END%%
%%ANKI
Basic
What is the standard `rdf` namespace an acronym for?
Back: **R**esource **D**escription **F**ramework.
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.
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## Bibliography
* 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.