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- From: ht@cogsci.ed.ac.uk (Henry S. Thompson)
- To: Brett McLaughlin <bmclaugh@algx.net>
- Date: 05 Jan 2000 23:36:54 +0000
Brett McLaughlin <bmclaugh@algx.net> writes:
> Alan Santos wrote:
> >
> > Hi,
> > I'm trying to wrap my head around the XMLSchema drafts to determine their
> > immediate usefulness (to myself), and have some very basic questions.
> >
> > 1) What is the difference between an archetype, type and datatype?
> > When is one used in place of the other.
>
> <archetype> is gone, replaced by <type>, which is used for specifying
> non-"primitive" (i.e. predefined) types for elements.
>
> <datatype> is for doing the same sort of operation on attributes.
>
> for example:
>
> <element name="myElement">
> <type>
> <element name="nestedElement" type="string" />
> <element name="anotherNestedElement" type="string" />
> <attribute name="isPrimary">
> <datatype content="empty" />
> </attribute>
> <attribute name="focus">
> <datatype content="NMTOKENS">
> <enumeration value="Java" />
> <enumeration value="C" />
> <enumeration value="XML" />
> </datatype>
> </attribute>
> </type>
> </element>
The spirit of the above is entirely correct, there are a few mistakes
in the details. For the overall story, see my reply to the original
post.
The example above is not quite schema-valid, as follows:
> <element name="myElement">
> <type>
> <element name="nestedElement" type="string" />
> <element name="anotherNestedElement" type="string" />
> <attribute name="isPrimary">
> <datatype content="empty" />
^^^^^^^
not allowed on <datatype>, I guess you want something like
<attribute name="isPrimary" type="boolean"/>
> </attribute>
> <attribute name="focus">
> <datatype content="NMTOKENS">
^^^^^^^
again, not quite right, I think you mean source="NMTOKEN"
> <enumeration value="Java" />
> <enumeration value="C" />
> <enumeration value="XML" />
> </datatype>
> </attribute>
> </type>
> </element>
Not surprisingly, I'm more positive about the utility of type
derivation than you are :-).
ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
URL: http://www.ltg.ed.ac.uk/~ht/
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