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SeMuDate-SAMT How To Align Media Metadata Schemas, Design And Implementation Of The Media Ontology

The document discusses the design and implementation of media ontologies aimed at aligning various media metadata schemas to address interoperability issues. It compares different approaches for expressing metadata mappings using semantic web technologies such as SKOS, OWL, and SWRL, and outlines both format-independent and dependent ontologies. The work highlights the ongoing progress in developing a media ontology and its accompanying API, encouraging feedback and collaboration in refining these standards.

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How to Align Media Metadata Schemas? Design and Implementation of the Media Ontology Florian Stegmaier, Werner Bailer, Tobias Bürger, Mario Döller, Martin Höffernig, Wonsuk Lee, Véronique Malaisé, Chris Poppe , Raphaël Troncy, Harald Kosch and Rik Van de Walle
Context How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria Interoperability issues EXIF MPEG-7 DC
W3C Media Annotations Working Group http://www.w3.org/2008/WebVideo/Annotations/ Mission Ontology common set of properties (currently 28) describing basic metadata for media resources identifier, title, language, creator, creation date, description, genre, rating, collection, copyright, target audience, frame size, sampling rate, bit rate,… mappings of existing formats to core ontology API access to the metadata e.g., getValues(“creator”) How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria
W3C Media Annotations Working Group Mappings currently represented by mapping table http://www.w3.org/2008/WebVideo/Annotations/drafts/ontology10/WD/mapping_table.htm How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria MAWG property Relation EBUCore How to do the mapping Datatype XPath ma:identifier exact dc:identifier string EBUCoreMain/ coreMetadata/ identifier/ dc:identifier
Mapping of Metadata Standards MA Ontology How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria MA properties API (Web Interface Definition Language) MPEG-7 Dublin Core EBUCORE EXIF … MEDIARDF MA mapping (expressed as mapping table) This paper compares different ways of implementing the MA mapping using semantic web technologies
Implementation approaches Two types expressing mappings using semantic web language SKOS OWL and SWRL expressing mappings through pivot upper ontology format independent ontology format dependent ontology Compared on simple and complex mapping ma:title ma:frameSize How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria
Use SKOS constructs to relate properties Simple Vocabularies need to be available in RDF Some mappings/conversions can not be expressed Mappings in SKOS SKOS:Collection How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria ma:title dc:title ma:frameSize Ebucore:formatHeight Ebucore:formatWidth SKOS:exactMatch SKOS:closeMatch
Mappings in OWL and SWRL Use OWL constructs to relate OWL concepts in each ontology Assume OWL ontologies are available for each metadata format How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria OWL:equivalentProperty ma:MediaResource dc:title ma:title
Mappings in OWL and SWRL Use rules (Semantic Web Rule Language) to define complex mappings Semantic and syntactic conversions How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria ma:frameSize_1 ebu:formatWidth_1 ebu:ResourceManifestation_1 Unit “ pixels” Value 352 RULE ma:width 352 ma:height 288 ma:MediaResource_1 ebu:formatHeight_1 Unit “ pixels” Value 352
Mappings in OWL and SWRL Benefits rules allow to do conversions of values e.g., summing integers, concatenating strings Drawbacks might be complex to express all mappings How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria
Format Independent Ontology Use a generic upper ontology describing metadata Map format-specific ontologies to the upper ontology mappings between the format-specific ontologies can be automatically inferred Consider the MA ontology as format-specific ontology Generic metadata ontology (MEON): allows to describe metadata Concept, AtomicConcept, CompoundConcept allows to describe relations between metadata elements defines, contains includes a set of generic concepts for media resources mainTitle, resolution, lines, columns, … How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria
Format Independent Ontology MeonOntology How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria contains cc1 resolution lines columns AtomicConcept CompoundConcept Concept instanceOf instanceOf defines defines defines defines
Format Independent Ontology MEON is central point to map metadata formats on each other Format-specific ontologies metadata formats described using MEON Concept, AtomicConcept, CompoundConcept, defines, contains mapped to generic media concepts of MEON through relation (modeled as a Class) qualifies the relation (e.g., exact, more specific) describes the mapping (e.g., hold functions for datatype conversion) How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria
Format Independent Ontology EBUCORE Ontology MeonOntology How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria cc1 MA Ontology ma:frameSize ebu:formatHeight1 ebu:formatWidth1 resolution lines columns relation relation relation
Format Dependent Metadata Ontology Ontology describes and relates elements of the metadata formats and the MA ontology MA properties described by MAWGMetadataProperty Class metadata formats properties described by StandardMetadataProperty Class mappings described by MetadataPropertyRelation Class holds transformation rule describes type of mapping identifies compound relations How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria
Format Dependent Metadata Ontology How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria MAWGMetadataProperty_01 MAWGMetadataProperty StandardMetadataProperty MetadataPropertyRelation propertyName “ ma:title” StandardMetadataProperty_01 propertyName “ dc:title” metadataName “ http: // purl . org /dc/ elements /1.1/ ” MetadataPropertyRelation_01 relationSemantic “ exact”
Conclusions No clear winner suggestions are welcome! Media ontology (including mappings) and API are work in progress feedback is welcome! How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria SKOS OWL + SWRL MEON Ontology Format dependent Ontology Complexity + + - + Scalability - - + - Reasoning - + + -
Questions? How to Align Media Metadata Schemas? Chris Poppe December 2 nd 2009, SeMuDate09, Graz, Austria