Metadata. ______________________________. Semantic Web Solutions: Web 2.0 and beyond. Stephanie Beene, 10/14/2008. ____________________________. Metadata: What is it?. several definitions, depending on the field... " data about data" is the most generic definition.
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Metadata ______________________________ Semantic Web Solutions: Web 2.0 and beyond Stephanie Beene, 10/14/2008
____________________________ Metadata: What is it? several definitions, depending on the field... • " data about data" is the most generic definition. • "structured information that describes, explains, locates, or otherwise makes it easier to retrieve, use, or manage an information resource" (NISO, 2004) . • "data associated with either an information system or an information object for purposes of description, administration, legal requirements, technical functionality, use and usage, and preservation" (DCMI Glossary, 2005). • In the lastdecade metadata standards & guidelines skyrocketedwith the proliferation of digital information. • As these standards & guidelines were created with local needs in mind, semantic silos were created.
The Problem: Since the first Dublin Core Workshop in 1995, metadata has expanded well beyond just describing documents. become a symbol for digital information organization and management. three phases over the past 13 years in metadata development: ~1995-1998: exploring and defining metadata in its Internet roles, how it adapts to domain-specific (local) requirements. ~~1998-2003: the Dublin Core became the international standard, domain-standards proliferate. Semantic Web goals: Interoperability and Standardization. We're in the third phase of metadata development: ~2003-present: theoretical frameworks, grassroots tagging. Dilemmas: ever-increasing volume of digital information; complexities, high cost, slow creation of metadata. ________________________________ Semantic Web Solutions
Library & Information Science Computer Science ___________________________________________ The Semantic Web Conversation "How can we build systems to respond better/more quickly to user requests?" "How can we describe information objects?" "We want a variety of responses to user queries" "How can we encode data in executable format into Web architecture?" "We want to capture data about digital objects..." "How can metadata become machine-processable?"
Outcomes to the Conversation: Ongoing process to unify the two paradigms of description & processability/executability. XML/RDF-based languages: combine semantic structures with computational syntax provide mechanisms for expressing relationships between classes of data that is computer/machine-processable. example: OWL ( Web Ontology Language): Application Profiles (DCMI): as a way to declare which elements from which namespaces are used in a particular application or project. schemas of data elements optimized for a specific local application Infrastructure streamlining (making all XML-compatible): XML/RDF as the data-binding language ____________________________ Semantic Web Solutions
The Metadata Jungle! http://homepages.cwi.nl/~troncy/Talks/WWW08/metadata_jungle.jpg
Attempts to tame the jungle... http://instructionaldesign.com.au/Academic/TechnicalTheme1_files/swtechnologies.jpg
Semantic Web Solutions ________________________________ Some Examples: • Archives Initiatives: • OAI Metadata Harvester: http://uilib-oai.sourceforge.net/ • California Digital Library OAI: http://cdlib-s10.cdlib.org/inside/projects/harvesting/ • Business Initiatives: • SAS (formerly Statistical Analysis Software, now just SAS): http://www.sas.com/technologies/dw/connectivity/index.html?gclid=CKak5uDGuJYCFQOIFQod_kVoLg • Mozenda (formerly Infosquire): http://www.infosquire.com/?gclid=CN_ilYfGuJYCFQKaFQodIBW1Kw • Library Initiatives: • Dublin Core Solutions: http://dublincore.org/tools/index.shtml • Siderean Software (Seamark): http://www.siderean.com/ • Sirsi Dynix Enterprise Solutions: http://www.sirsidynix.com/Solutions/Products/portalsearch.php • Millennium Triple I: http://www.iii.com/
Sources ____________________________ Lei Zeng, Marcia and Jian Qin (2008). Metadata. New York: Neal-Schumann Publishers, Inc. Class readings & links you see on this presentation