Report from Workshop 8: XML and related technologies ELAG 2001 Jan Erik Kofoed BIBSYS Library Automation.

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Presentation transcript:

Report from Workshop 8: XML and related technologies ELAG 2001 Jan Erik Kofoed BIBSYS Library Automation

2 Background material Crossnet: Using XSLT For XML MARC Record Conversion Using XSLT For XML MARC Record Conversion Kofoed, Jan Erik: XML and friends –Part 1: XML and DTDPart 1: XML and DTD –Part 2: XML SchemaPart 2: XML Schema MARC records in OAI XML format MARC records in XML format from BIBSYS and DBC

3 Topics discussed 1.Why XML?XML 2.XML and electronic publishing 3.XML and cataloguing 4.XML and data base systems 5.Transformation of XML 6.Query languages for XML 7.DTD vs. XML Schema 8.XML and Z Programming skill needed? 10.Tools and utilities for XML

4 Why XML? Bibliographic data is structured, XML is well prepared for describing structure. Much bibliographic data has a tree structure, (f.ex. MARC data). XML is also tree structured. Data structured in XML is well suited for exchange.

5 XML and electronic publishing Expressions of works stored in XML can easily make basis for different manifestations such as: –printed copies –electronic versions in PDF or PostScript –versions for display on screens with different resolutions Metadata can be added directly to the document as part of the XML structure The authors need training and encouragement

6 XML and cataloguing XML is well suited for representing MARC records Two methods: 1.Generic elements: Best method for exchange of data, can replace use of ISO Named elements: Good for internal use in library systems

7 XML and data base systems Several RDBMS has added support for XML (Oracle, IBM DB2 and others) –XML stored in a single cell –XML stored as a collection of tables –Special DML for handling XML Specialized "native" XML DBS (Tamino from Software AG) –XML stored directly in a special internal structure made for handling XML

8 Transformation of XML There is need for transforming bibliographic records for exchange between systems Use of XSLT together with XML simplifies this process XML + XSLT might replace programs for generating and interpreting ISO-2709

9 Query languages for XML XQL – an early suggestion for W3C. Used in the first version of Tamino XSQL – an extension of SQL for use with XML stored in Oracle DB XPath – a W3C recommendation for addressing parts of XML documents. Used in current version of TaminoXPath XML Query – work at W3C for developing a new query language for XMLXML Query

10 DTD vs. XML Schema DTD is inherited from SGML. XML Schema is a new W3C recommendation (of 2 May 2001)XML Schema DTD and Schema make it possible to validate XML documents DTD and Schema both describe structure Schema is much better for describing groups and alternatives, and especially data types, constraints and patterns Time has come for changing from DTD to Schema

11 XML and Z39.50 New version of Z39.50 is being developed that uses both XML and SOAPZ39.50XMLSOAP Follow the progress closely!

12 Programming skill needed? Basic XML with DTD or Schema do not require any programming skill. (An advantage to think structured and orderly, i.e. be an librarian!)XML XSL (XSLT) needs some skill in programming.XSL

13 Tools and utilities for XML DB2XML - free – SXQL - free – Microsoft XML Notepad - free – Apache XML Project - free – SoftQuad XMETAL - commercial – XML Spy - commercial –