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How Do We Represent It To The Outside World?

File metaphor too primitive: just a blob

Table metaphor too primitive: just records

Need Metadata describing data context

Format

Providence  (author/publisher/ citations/…)

Rights

History

Related documents

In a standard format

XML and XML schema

DataSet is great example of this

World is now defining standard schemas

schema

Data or

difgram

<?xml version="1.0" encoding="utf-8" ?>

- <DataSet xmlns="http://WWT.sdss.org/">

- <xs:schema id="radec" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">

<xs:element name="radec" msdata:IsDataSet="true">

<xs:element name="Table">

  <xs:element name="ra" type="xs:double" minOccurs="0" />

  <xs:element name="dec" type="xs:double" minOccurs="0" />

- <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1">

- <radec xmlns="">

- <Table diffgr:id="Table1" msdata:rowOrder="0">

  <ra>184.028935351008</ra>

  <dec>-1.12590950121524</dec>

  </Table>

- <Table diffgr:id="Table10" msdata:rowOrder="9">

  <ra>184.025719033547</ra>

  <dec>-1.21795827920186</dec>

</Table>

</radec> 

</diffgr:diffgram>

</DataSet>

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