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EAD Revision: Technical Considerations Terry Catapano EAD Roundtable Meeting 2011-08-24

EAD Revision: Technical Considerations Terry Catapano EAD Roundtable Meeting 2011-08-24. Overview. Schema Language Choices EAD as Vocabulary/Ontology EAD Subset Tools. Schema: Languages. Options DTD W3C XML Schema RelaxNG Maintenance? Distribution?. Schema Languages: Features. XML

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EAD Revision: Technical Considerations Terry Catapano EAD Roundtable Meeting 2011-08-24

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  1. EAD Revision: Technical Considerations Terry Catapano EAD Roundtable Meeting 2011-08-24

  2. Overview • Schema Language Choices • EAD as Vocabulary/Ontology • EAD Subset • Tools

  3. Schema: Languages • Options • DTD • W3C XML Schema • RelaxNG • Maintenance? • Distribution?

  4. Schema Languages: Features • XML • Documentation and “appinfo” • Strong Datatyping • Namespace Support • External • Internal • Allow Any? • Allow Some? (Xlink, EAC?, MODS?) • Maintenance/preservation implications • Parsing, Validation, Processing

  5. Vocabularies/Abstract Model • Vocabulary for describing: • Archival descriptions (records/documents) [Tag Library] • Archival components (things) • Establish URIs • Formal Expression (SKOS?, RDFS?, OWL?) • Implemented in schemata, xml instances • TEI, NISO JATS, Dublin Core, DarwinCore...

  6. Vocabularies, con't • Enumerated values • c/@level • Complement, Incorporate others • LOCAH • Aaron Rubenstein/ http://purl.org/archival/vocab/arch • Dublin Core, others...?

  7. SKOS Straw Man <rdf:RDFxmlns:ead="http://example.info/ead/vocabulary/"xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"xmlns:skos="http://www.w3.org/2004/02/skos/core#"><skos:Concept rdf:about="http://www.example.info/ead/vocabulary/c/"><skos:prefLabel>Component</skos:prefLabel><skos:definition>A subordinate part of [described archival] materials...An intellectually logical section of... described [archival] materials...A stage within a hierarchical description of [archival materials].</skos:definition></skos:Concept><skos:Concept rdf:about="http://www.example.info/ead/vocabulary/unittitle/"><skos:prefLabel>Unittitle</skos:prefLabel><skos:definition>The name, either formal or supplied, of described [archival] materials. May consist of a word, phrase, character, or group of characters...The &lt;unittitle&gt; is comparable to ISAD(G) element 3.1.2 and MARC field 245</skos:definition></skos:Concept></rdf:RDF>

  8. Profiling/Subsetting • Base Schema + Subset(s) • Endorsed/Official? • Facilitate User created? • Similar to approaches of other tagsets (TEI; JATS) • Schematron • Rules-based Validation • XPATH Based

  9. Schematron: Example <sch:pattern name="Co-Occurrence Constraints"><sch:rule context="*[@level ='otherlevel']"><sch:assert test="string-length(@otherlevel) &gt; 1"> If the value of a level attribute is "otherlevel', then the otherlevel attribute must be used </sch:assert></sch:rule></sch:pattern> <sch:pattern name="Elements Removed"> <sch:rule context="ead:chronlist"> <sch:report test=".">ERROR: <sch:name/> ELEMENT NOT ALLOWED</sch:report> </sch:rule> </sch:pattern> <sch:pattern name="No Mixed Content"> <sch:rule context="*"> <sch:report test="child::ead:* and text()[string-length(normalize-space(.)) != 0]" >ERROR: Mixed content is not allowed</sch:report> </sch:rule> </sch:pattern>

  10. Tools • Migration • DTD to Schema • 2002 to EAD X • Validation (e.g., Schematron) • Conversions? • “EAD Tidy” • EAD to RDF • Pipelines (XProc) • Packaging?

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