RE: [xmlschema-dev] <none>

2.2.4.2 Type Alternative


A type-alternative component (type alternative for short) associates a type definition with a predicate. Type alternatives are used in conditional type assignment, in which the choice of ·governing type definition· <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#key-governing-type-elem>  for elements governed by a particular element declaration depends on properties of the document instance. An element declaration may have a {type table} <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#ed-type_table>  which contains a sequence of type alternatives; the predicates on the alternatives are tested, and when a predicate is satisfied, the type definition paired with it is chosen as the element instance's ·governing type definition· <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#key-governing-type-elem> .

Note: The provisions for conditional type assignment are inspired by, but not identical to, those of [SchemaPath] <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#bib-schemapath> .

For detailed information on Type Alternatives, see Type Alternatives (§3.12) <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#cTypeAlternative> .

http://www.w3.org/TR/2007/WD-xmlschema11-1-20070830/

and

<alternative
  id = ID <http://www.w3.org/TR/2006/WD-xmlschema11-2-20060217/datatypes.html#ID> 
  test = an XPath expression
  type = QName <http://www.w3.org/TR/2006/WD-xmlschema11-2-20060217/datatypes.html#QName> 
  xpathDefaultNamespace = (anyURI <http://www.w3.org/TR/2006/WD-xmlschema11-2-20060217/datatypes.html#anyURI>  | (##defaultNamespace | ##targetNamespace | ##local))
  {any attributes with non-schema namespace . . .}>
  Content: (annotation <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#element-annotation> ?, (simpleType <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#element-simpleType>  | complexType <https://webmail.planet.nl/exchange/wilde825@planet.nl/Drafts/RE:%20%5Bxmlschema-dev%5D%20%3Cnone%3E.EML/1_text.htm#element-complexType> )?)
</alternative>

http://www.w3.org/TR/2007/WD-xmlschema11-1-20070830/#cTypeAlternative

Does this mean that in near future I'd be able to use something (a la XSLT) similair to:

 
<complexType name="typeQry[@type='filter']">
  [..]
</complexType>
 
Not fully clear to me. Would be really great. (Type as seen as temp replacement by the relative DOM available for xpath.
Robert de Wilde
wilde825@planet.nl

________________________________

Van: Michael Kay [mailto:mike@saxonica.com]
Verzonden: vr 4-4-2008 15:43
Aan: wilde825@planet.nl; xmlschema-dev@w3.org
Onderwerp: RE: [xmlschema-dev] <none>


The next version of XML Schema will be numbered 1.1. It includes quite a few new facilities, of which one, "Conditional Type Assignment" seems to correspond to what you are looking for. Check the specification at 
 
http://www.w3.org/TR/2007/WD-xmlschema11-1-20070830/
 
especially section 3.12.1
 
Michael Kay
http://www.saxonica.com/


________________________________

	From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org] On Behalf Of wilde825@planet.nl
	Sent: 04 April 2008 20:17
	To: xmlschema-dev@w3.org
	Subject: [xmlschema-dev] <none>
	
	
	Hello XML-Schema devvers,
	 
	Is there anyone who can give me more information about the development of newer Schema version like 2.0? I'd need more support for checking co-relation (or how they call it) and using validation based on attribute value. If XML Schema isn't being activily developed anymore I can look further.
	 
	I hope someone can share this information, because Google wasn't being my best friend.
	 
	Hope to here from anyone soon!
	 
	Robert de Wilde
	wilde825@planet.nl