downlode.org > Code > RDF Vocabularies and Representations > File Properties

File Properties Vocabulary

This version:

http://downlode.org/Code/RDF/File_Properties/2006-04-24.html

Latest version:

http://downlode.org/Code/RDF/File_Properties/

Previous version:

http://downlode.org/Code/RDF/File_Properties/2005-12-23.html

Author:

Earle Martin

Copyright © 2005-6 Earle Martin.

This work is licensed under a Creative Commons License. This copyright applies to the File Properties Vocabulary documentation and does not apply to the File Properties Vocabulary data formats, vocabulary terms, or technology. Regarding underlying technology, the File Properties Vocabulary relies heavily on W3C's RDF technology, an open Web standard that can be freely used by anyone.

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Abstract

This resource aims to provide a simple method of representing some properties of files. The vocabulary is defined in RDF and OWL.

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Usage

Following is an example of a simple RDF document describing a file on a computer.

<rdf:RDF
  xmlns:rdf  = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:dc   = "http://purl.org/dc/elements/1.1/"
  xmlns:foaf = "http://xmlns.com/foaf/0.1/"
  xmlns:wn   = "http://xmlns.com/wordnet/1.6/"
  xmlns:fp   = "http://downlode.org/Code/RDF/File_Properties/schema#"
>

<fp:File rdf:about="http://example.com/photo.jpg">
  <dc:title>A photograph of something.</dc:title>
  <foaf:maker rdf:resource="http://example.com/foaf.rdf#Some_Person" />
  <fp:created>2003-03-20T20:00+03:00</fp:created>
  <fp:modified>2005-12-14T18:42+00:00</fp:modified>
  <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
  <fp:format>image/jpeg</fp:format>
  <fp:size>27639</fp:size>
 
  <fp:checksum>
    <fp:Checksum>
      <fp:generator>
        <!--
        To define what created this Checksum, we're using the Wordnet definition of
        "Algorithm" as the class, and describing it with the Wikipedia definition of MD5.
        -->
        <wn:Algorithm rdf:about="http://en.wikipedia.org/wiki/MD5" />
      </fp:generator>
      <fp:checksumValue>e89760b5510974acbea8ff4c77a1a5c0</fp:checksumValue>
    </fp:Checksum>
  </fp:checksum>
 
</fp:File>

</rdf:RDF>

The vocabulary is defined in the schema file.

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Classes in this vocabulary
Name	Description
fp:File	A file of some kind.
fp:Checksum	A checksum generated from an fp:File, presumably by some kind of process.
fp:Process	A process is a series of events.
Properties in this vocabulary
Name	Domain	Range	Description	Sub-property of
fp:format	fp:File	rdfs:Literal	The format of an fp:File. Recommended to be a content-type string.	dc:format
fp:size	fp:File	rdfs:Literal	The size of an fp:File, in bytes.
fp:created	fp:File	rdfs:Literal	When an fp:File was created, preferably in W3C DTF.	dc:created
fp:modified	fp:File	rdfs:Literal	When an fp:File was last modified, preferably in W3C DTF.	dc:modified
fp:checksum	fp:File	fp:Checksum	Indicator that an fp:File has an fp:Checksum.
fp:checksumValue	fp:Checksum	rdfs:Literal	The string content of an fp:Checksum.
fp:generator		rdfs:Resource	Relates a thing to what generated it.

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Changes since last version

After a lot of discussion on #swig with Sean Palmer, the following changes were made:

• Removed several redundant properties.
• creator renamed to generator and is no longer an instance of foaf:maker.
• Switched to using absolute URIs for schema terms.

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Acknowledgements

Parts of the layout of this document and the licensing information were adapted from the FOAF Vocabulary Specification by Dan Brickley and Libby Miller.

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