A RDF Metadata Model for OpenDocument Format 1.2 Svante Schubert Software Engineer Sun Microsystems Inc.

Svante Schubert

Software Engineer

Sun Microsystems Inc.

About the Speaker Since 1999 working for Sun Microsystems on StarOffice Since 2006 co-lead of OpenOffice XML project Responsible for the XML based filters Co-editor of the OASIS Metadata Specification

Since 1999 working for Sun Microsystems on StarOffice

Since 2006 co-lead of OpenOffice XML project

Responsible for the XML based filters

Co-editor of the OASIS Metadata Specification

Agenda Metadata basics / existing standards Metadata model of ODF 1.2 Metadata support in OpenOffice.org 3

Metadata basics / existing standards

Metadata model of ODF 1.2

Metadata support in OpenOffice.org 3

Metadata Basics “ The solution to the overabundance of information is more information.” David Weinberger Everything Is Miscellaneous: The Power of the New Digital Disorder

Metadata Basics What is metadata? “Metadata is data about data” 1) Why do I need metadata? Enhanced search Workflow Accessibility Citation Bridge the semantic gap (e.g. zip vs. post code, native languages) ... 1) http://en.wikipedia.org/wiki/Metadata

What is metadata?

“Metadata is data about data” 1)

Why do I need metadata?

Enhanced search

Workflow

Accessibility

Citation

Bridge the semantic gap (e.g. zip vs. post code, native languages)

...

Metadata Basics More Precise Metadata Definition What is metadata? Labels to identify/categorize your data Related data Why do I need metadata? Metadata makes your data interpretable by other applications

What is metadata?

Labels to identify/categorize your data

Related data

Why do I need metadata?

Metadata makes your data interpretable by other applications

Metadata Basics Extending current ODF Metadata Support Why a new metadata model? Current ODF metadata related to document Not extensible Content tagging by styles is not enough! Styles are not descriptive Styles are not interchangeable with other applications

Why a new metadata model?

Current ODF metadata related to document

Not extensible

Content tagging by styles is not enough!

Styles are not descriptive

Styles are not interchangeable with other applications

Metadata Basics The Idea of the Semantic Web What is the Semantic Web / Data Web? A web, where software can find/combine/share information more easily Requirements of Semantic Web / Data Web Data annotated in a common way using metadata Web applications acting upon standardized metadata

What is the Semantic Web / Data Web?

A web, where software can find/combine/share information more easily

Requirements of Semantic Web / Data Web

Data annotated in a common way using metadata

Web applications acting upon standardized metadata

Existing Metadata Standards Resource Description Framework (RDF) RDF/XML is W3C Recommendation (2004) Resources Unique identification by IRI Described by RDF statements RDF Statements - Triple: subject + predicate + object uri://sun/employees/svante foaf:name “Svante Schubert” .

RDF/XML is W3C Recommendation (2004)

Resources

Unique identification by IRI

Described by RDF statements

RDF Statements - Triple: subject + predicate + object

uri://sun/employees/svante foaf:name “Svante Schubert” .

Existing Metadata Standards RDF Graphs... Based on http://www.w3.org/2000/Talks/1206-xml2k-tbl/slide6-0.html

Existing Metadata Standards ...superimpose Based on http://www.w3.org/2000/Talks/1206-xml2k-tbl/slide7-0.html

Existing Metadata Standards Web Ontology Language (OWL) Ontology (from Greek) Onto (being) Logia (written/spoken discourse) Description of entities/concepts and their relations Like OO language using classes, properties, etc. ODF 1.2 includes OWL package description OWL Classes of pkg:Package, pkg:File, odf:Element

Ontology (from Greek)

Onto (being)

Logia (written/spoken discourse)

Description of entities/concepts and their relations

Like OO language using classes, properties, etc.

ODF 1.2 includes OWL package description

OWL Classes of pkg:Package, pkg:File, odf:Element

Metadata Model of ODF 1.2 Metadata Files in the Package RDF file e.g. “/meta/data.rdf” Content file e.g. “/styles.xml” Meta data manifest “ /manifest.rdf” RDF file e.g. “/meta/cita.rdf” Content file e.g. “/content.xml”

Metadata Model of ODF 1.2 Metadata Files in the Package Content files (e.g. content.xml, styles.xml) About 50 ODF elements with xml:id attribute Metadata manifest (manifest.rdf) Heart of metadata model Mapping from content's xml:id to RDF IRIs User RDF/XML files Metadata file possibly from an office extension

Content files (e.g. content.xml, styles.xml)

About 50 ODF elements with xml:id attribute

Metadata manifest (manifest.rdf)

Heart of metadata model

Mapping from content's xml:id to RDF IRIs

User RDF/XML files

Metadata file possibly from an office extension

Metadata Model of ODF 1.2 Metadata Files in the Package <table:table xml:id=” someID ”> ... Hospital Doctor Duty List ... </table:table> RDF files e.g.“/meta/data.rdf” <odf:ContentFile pkg:path=&quot; content.xml &quot;> <pkg:hasPart> <odf:Element rdf:about=&quot; uri:someIRI &quot; pkg:idref=&quot; someID &quot;/> Content files e.g. “/content.xml” <odf:Element rdf:about=&quot; uri:someIRI &quot;> <ex:workingHoursOf> <med:Doctors rdf:about=&quot; http://hospital-DB/doctors/ID116 &quot;> <med:fieldName xml:lang=&quot;en&quot;>Neurologist</med:fieldN. Meta data manifest “ /manifest.rdf”

Metadata Model of ODF 1.2 In Content Metadata If metadata is equal text/visual data Reason: No data duplication Used by ODF 5 elements: Bookmark start - <text:bookmark-start> Heading - <text:h> Metadata text - <text:meta> Paragraph - <text:p> Table cell - <table:table-cell>

If metadata is equal text/visual data

Reason: No data duplication

Used by ODF 5 elements:

Bookmark start - <text:bookmark-start>

Heading - <text:h>

Metadata text - <text:meta>

Paragraph - <text:p>

Table cell - <table:table-cell>

Metadata Model of ODF 1.2 In Content Metadata <text:p>The doctor's name was <text:meta m:about=” http://hospital-DB/doctors/ID116 ” m:property=” http://xmlns.com/foaf/0.1/name ”> Dr. J. Franklin</text:meta> RDF files e.g.“/meta/data.rdf” Content files e.g. “/content.xml” <med:Doctor rdf:about=&quot; http://hospital-DB/doctors/ID116 &quot;> <med:hasPatient> <med:Patient rdf:about=”http://hospital-DB/patients/IDA1”>

Metadata Model of ODF 1.2 Metadata Text Field ODF field “text:meta-field” based on metadata Appears within paragraph Holds any paragraph content Citation example: “According to [2]” <text:p>According to <text:meta-field xml:id=” someID ”> <text:style text:style-name=”s1”>[2]

ODF field “text:meta-field” based on metadata

Appears within paragraph

Holds any paragraph content

Citation example: “According to [2]”

Existing Metadata Standards Semantic Web Architecture Based on http://www.w3.org/2000/Talks/1206-xml2k-tbl/slide10-0.html

Existing Metadata Standards ODF in the Semantic Web Based on http://www.w3.org/2000/Talks/1206-xml2k-tbl/slide10-0.html

Metadata support in OOo 3 Support of metadata in the ODF 1.2 package API for metadata extension developers Providing UNO APIs to access metadata Wrapping existing opensource tools Some possible choices: Jena, Sesame, librdf, RDF Twig Possibility of a generic metadata extension Import / Create your own RDF vocabulary Relate vocabulary to ODF content by GUI

Support of metadata in the ODF 1.2 package

API for metadata extension developers

Providing UNO APIs to access metadata

Wrapping existing opensource tools Some possible choices: Jena, Sesame, librdf, RDF Twig

Possibility of a generic metadata extension

Import / Create your own RDF vocabulary

Relate vocabulary to ODF content by GUI

More Information Contact me here at OOoCon 2007 Download latest docs: http://www.oasis-open.org/committees/ documents.php?wg_abbrev=office-metadata RDF N3 Tutorial: http://www.w3.org/2000/10/swap/Primer RDF Converter: http://www.mindswap.org/2002/rdfconvert/ http://blogs.sun.com/GullFOSS

Contact me here at OOoCon 2007

Download latest docs: http://www.oasis-open.org/committees/ documents.php?wg_abbrev=office-metadata

RDF N3 Tutorial: http://www.w3.org/2000/10/swap/Primer

RDF Converter: http://www.mindswap.org/2002/rdfconvert/

http://blogs.sun.com/GullFOSS

Thank you – Questions & Answers Svante Schubert [email_address]

Svante Schubert

[email_address]