Difference between revisions of "Tracker CC Indexing"

Google Summer of Code Project: “Indexing Embedded License Claims in Tracker”

Here's some relevant (now revised) sections of the Summer of Code application:

License Metadata Summary

Indexing Licenses in Tracker Summary

Timeline

UPDATE: It's going to be difficult to estimate progress of when I'll do what. Patches are being sent upstream of various dependencies of Tracker. Completion of indexing of particular formats varies as I await approval of patches and feedback from upstream, as well as Jamie's approval of patches into Tracker itself. I'll be working on various aspects of the project in parallel as I await feedback/approval on a particular aspect.

Check out the above table of progress for where I'm at with what.

By week 12: Tie things up for submission of code

Implementation

XMP

The following is an excerpt of raw XMP describing a work licensed under the CC Attribution 3.0 license.

<?xpacket begin='' id=''?><x:xmpmeta xmlns:x='adobe:ns:meta/'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>

 <rdf:Description rdf:about=''
  xmlns:xapRights='http://ns.adobe.com/xap/1.0/rights/'>
  <xapRights:Marked>True</xapRights:Marked>
 </rdf:Description>

 <rdf:Description rdf:about=''
  xmlns:dc='http://purl.org/dc/elements/1.1/'>
  <dc:rights>
   <rdf:Alt>
    <rdf:li xml:lang='x-default' >This work is licensed under a Creative Commons
 Attribution 3.0  License.</rdf:li>
   </rdf:Alt>
  </dc:rights>
 </rdf:Description>

 <rdf:Description rdf:about=''
  xmlns:cc='http://creativecommons.org/ns#'>
  <cc:license rdf:resource='http://creativecommons.org/licenses/by/3.0/'/>
 </rdf:Description>

</rdf:RDF>
</x:xmpmeta>
<?xpacket end='r'?>

To fit Tracker's metadata structure, the extracted license claim would be placed into the File:License field in a form such as: "This work is licensed under a Creative Commons Attribution 3.0 License (http://creativecommons.org/licenses/by/3.0/)". Such a format allows for searching the license field by both license name and URL.

Specifically,

/rdf:Description[@xmlns:dc='http://purl.org/dc/elements/1.1/']/dc:rights/rdf:Alt/rdf:li/text()

and

/rdf:Description[@xmlns:cc='http://creativecommons.org/ns#']/cc:license/attribute:rdf:resource

Will be stored in Tracker's File:License field.

Links

• Related works
  • cclookup (http://wiki.creativecommons.org/CcLookup) - Python application for extracting license RDF metadata or license metadata from mp3s. Code may be adapted for parsing license claims in C
  • ccpublisher (http://wiki.creativecommons.org/CcPublisher) - Licenses embedded by ccpublisher should all be correctly extracted.
• Related links
  • http://creativecommons.org/technology/usingmarkup
  • http://wiki.creativecommons.org/RDFa