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Optionality, Collectors, and validity

  • From: "Toby Considine" <Toby.Considine@gmail.com>
  • To: "xml-Dev Listserv" <xml-dev@lists.xml.org>
  • Date: Sat, 26 Mar 2011 16:15:50 -0400

I am working on some schemas that rely on other schemas, and t we are
arguing about the validity of artifacts produced. In particular, in the
upstream schema, there are collections of things that are optionally
attached to parents. Say we have the following:

<xs:complexType name="BaseComponentType" abstract="true">
      <xs:element name="components" type="ArrayOfComponents"/>
  <xs:element name="baseComponent" type="BaseComponentType"/>
  <xs:complexType name="ArrayOfComponents">
      <xs:element ref="baseComponent" minOccurs="0" maxOccurs="unbounded"/>

BaseComponent is an abstract type with many derivative types. With 3 4
dreivitave components, you might have an instance artifact like:

  <foo />
  <fie />
  <fee />
  <fum />

If there are no components, you might have
<components />

In the larger message, you might have a schema that specifies
<xs:complexType name="parentType" abstract="true">
      <xs:element ref="shoeSize" type="shoeSizeType"/>
      <xs:element ref="favoriteFood" type=" favoriteFoodType "/>
      <xs:element ref="components" type="ArrayOfComponents"/>

  <components />

is legal. Is 


Also legal? Different development tools prefer one or the other result, but
some flag the second as ill-formed.



“The single biggest problem in communication is the illusion that it has
taken place.” 
– George Bernard Shaw.

Toby Considine
TC9, Inc
TC Chair: oBIX & WS-Calendar
TC Editor: EMIX, EnergyInterop
U.S. National Inst. of Standards and Tech. Smart Grid Architecture Committee

Email: Toby.Considine@gmail.com
Phone: (919)619-2104
blog: www.NewDaedalus.com

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