Kein Folientitel

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EPGRIS - Establishment of an European Plant
Genetic Resources Information Infra-Structure Half
-term Coordination Meeting, 14-/15 June, Oeiras
XML - a Solution for EURISCO Sabine
Roscher Zentralstelle für Agrardokumentation
und -information (ZADI) Informationszentrum
Biologische Vielfalt (IBV)
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• What is XML ?
• XML (Extensible Markup Language) is a simplified
  form of SGML (Standard
• Generalized Markup Language)
• The Elements (tags) are user defined, contrary
  to html which is a markup
• language with predefined elements

Example ltAccessionNumbergtDAU 16lt/AccessionNumber
gt

• Data are separated from markup, advantage for
  portability of data
• Basic functionality XML permits to arrange a
  document hierarchy
• and to name
  individual parts of it (name of element types)

Example ltAccessiongt
ltAccessionNumbergtK 5668lt/AccessionNumbergt
ltOrigctygtItalylt/Origctygt
lt/Accessiongt
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• XML offers a standard for data exchange and
  structure of information,
• data can be combined with syntax and semantic
• -gt promotion of standard (The EURISCO-Schema)

• Contents and structure of XML documents can be
  specified and validated with
• DTDs or XML-Schema, so that the compatibility
  of the documents is ensured.
• -gt makes information exchange with different
  partners easy and
• means a substantial simplification for
  the development of applications,
• because thereby many later error
  inquiries are no longer necessary.

• Results of data base queries can be formatted
  directly in XML without further conversion
• for data exchange and without the necessity
  to generate a fixed format like
• ASCII-files (e.g. XSQL-Servlet ORACLE)

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DTD versus Schema XML Schema is the newer
development, which is not completely supported
yet by all XML tools, which will in the long
term probably become generally accepted however
due to several advantages opposite DTDs.

• Advantage of using XML
• Promotion of standard
• User friendly presentation of data
• Basis for information networking

• Substantial advantages of Schema are
• Definitions are even likewise in XML written,
  while DTD uses own syntax
• Elements and attributes are assigned primitive
  or self defined data types,
• whereby also transmission is possible. Also
  ranges of values can be defined.
• This extends the possibilities of validating.
• By the use of name spaces different elements of
  a document can refer to
• different Schema.

Further reading http//www.w3.org/XML/ http//x
ml.apache.org/ http//www.w3schools.com/default.a
sp
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The following slides show a draft
EURISCO-Schema data exchange format for EURISCO
written in XML The structure is based on the
Multicrop Passport Descriptor List
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Example of XML-Data
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The data look like this, when you open the same
xml-file with Internet Explorer. (A so called
xsl-file (stylesheet) is used for the
html-presentation of the data.)
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Thanks for your attention!