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Subject: Copy of OASIS Symposium Proposal
XRI and XDI TC Members: I had the action item from the last XDI TC meeting to discuss with XRI TC co-chair making the proposed OASIS Symposium presentation a joint presentation of the XRI and XDI TCs. Gabe agreed, seeing that XRIs were "the star of the show". Following is the presentation abstract I submitted today (just under the deadline). =Drummond TITLE: XRIs and XDI Dictionaries: A New Approach to XML Vocabulary Sharing SHORT DESCRIPTION: This presentation will explore a new approach from the OASIS XRI and XDI TCs for cross-domain vocabulary sharing based on abstract identifiers and interoperable dictionaries. This approach, which mirrors the development of generic words in human languages, has special applicability in very large or very dynamic networks where conventional XML schema standardization is difficult if not impossible. ABSTRACT: In January 2003 the OASIS XRI (Extensible Resource Identifier) Technical Committee began defining a URI-compatible identifier scheme and resolution protocol for abstract identifiers. XRIs are location-, application-, and transport-independent; support both reassignable and persistent identifiers in one syntax; and have special syntax called "cross-references" that permits the same logical identifier to be shared across multiple physical domains. XRI 1.0 was published as a Committee Draft in January 2004; XRI 2.0, which incorporates changes in the underlying IETF URI and IRI specifications, is due January 2005. XRI cross-references offer a new solution to mapping data elements across domains. This approach is being further pursued by the XDI (XRI Data Interchange) TC, which is developing an XML schema for describing XRI-identified resources. The XDI schema can be used to publish a set of logical XRIs, called an XDI dictionary, which members of a data sharing community can use to establish local mappings to XML schemas and physical data stores. Data can then be shared and linked across any two communities that share the same XDI dictionaries. This "Dataweb" model has special applicability to the problem of vocabulary sharing in very large or very dynamic networks, where conventional XML schema standardization is difficult if not impossible. Communities can use XDI dictionaries the same way people use paper dictionaries to establish the generic nouns required for common understanding. XDI dictionaries can also evolve dynamically using dictionary spiders that perform the time-consuming task of monitoring and mapping a network of dictionaries and proposing equivalences or transforms between them that can be validated by humans. This presentation will demonstrate an open XDI dictionary sharing implementation using XRI 2.0 and the draft XDI specifications; will explain the key differences and complementary aspects between the XRI cross-reference/XDI dictionary approach and RDF; and will propose additional OASIS work on XML vocabulary sharing using this model.
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