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GRITS Working with AVM Data

Astronomy Visualization Metadata June 11th, 2010 Casey Rosenthal clr@ipac.caltech.edu. GRITS Working with AVM Data. Presentation Overview. AVM Data Formats Software Packages to Read/Write AVM One Implementation Future Possible Implementations. AVM Data Format.

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GRITS Working with AVM Data

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  1. Astronomy Visualization Metadata June 11th, 2010 Casey Rosenthal clr@ipac.caltech.edu GRITSWorking with AVM Data

  2. Presentation Overview • AVM Data Formats • Software Packages to Read/Write AVM • One Implementation • Future Possible Implementations

  3. AVM Data Format • AVM is XMP [eXtensible Metadata Platform] • XMP is RDF [Resource Description Framework] • RDF is XML [eXtensible Markup Language] • http://virtualastronomy.org/avm_metadata.php

  4. XMP • Stores Metadata in Media Files • Created by Adobe • Implemented in many Adobe Products • http://www.adobe.com/products/xmp/

  5. RDF • W3C Standard • URIs to Describe Relationships as 'Triples' • Graph Data Merges [Semi-]Structured Schemas • Intended for Semantic Web • http://www.w3.org/RDF/

  6. XML • W3C Standard • Text Format for Describing Data • http://www.w3.org/XML/

  7. XML Example: • <?xml version="1.0"?> • <!DOCTYPE "country.dtd"> • <country> • <name>USA</name> • <state> • <name>California</name> • </state></country>

  8. RDF Example: • <?xml version="1.0"?> • <rdf:RDF xmlns:rdf="..." xmlns:cd="http://..."> • <rdf:Description rdf:about="http://..."> • <cd:artist>Good Artist</cd:artist> • <cd:year>1985</cd:year> • </rdf:Description> • </rdf:RDF>

  9. XMP Example: • <?xml version="1.0"?> • <x:xmpmeta xmlns:x='adobe:ns:meta/'> • <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> • ... • </rdf:RDF> • </x:xmpmeta>

  10. AVM Example: • <?xml version="1.0"?> • <x:xmpmeta xmlns:x="adobe:ns:meta/"> • <rdf:RDF> • <rdf:Description xmlns:avm="http://www.communicatingastronomy.org/avm/1.0/"> • <avm:CreatorURL> • http://www.spitzer.caltech.edu • </avm:CreatorURL>

  11. Software to Read/Write XMP Adobe's XMP Toolkit SDK • C++ • Unix/Mac/Windows cross-platform • BSD License

  12. Libraries • Adobe XMP Toolkit SDK (C++) • Adobe XMP Library for ActionScript (AS) • Exempi (C) • Python XMP Toolkit (Python) • ExifTool (Perl) • SemWeb.NET (C#/.Net/Mono) • PHP Jpeg Metadata Toolkit (PHP)

  13. Library Status • Fractured and Partial Support • Adobe Changes Format • Adobe Changes Underlying Toolkit • => Implementation Support Issues

  14. One Implementation • Ruby Wrapper to ExifTool via Pipes • Read as XML, Search Using XPath • Write as Command-Line Options • Custom AVM Template for ExifTool[http://github.com/clr/astronomy_visualization_metadata_exiftool_profile]

  15. Future Possible Implementations • Central Authoritative AVM Servers • Open APIs for Collaboration • RDBMS Servers (SQL) • Document Storage Engines (NoSQL) • RDF Query Engines • XQuery

  16. Resources • http://www.adobe.com/products/xmp • http://www.w3.org/RDF • http://virtualastronomy.org/avm_metadata.php • http://code.google.com/p/python-xmp-toolkit/ • http://www.sno.phy.queensu.ca/~phil/exiftool/ • Casey Rosenthal: clr@ipac.caltech.edu

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