[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Basic XMLSchema questions
Brett McLaughlin <bmclaugh@a...> 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@c... URL: http://www.ltg.ed.ac.uk/~ht/ xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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