Hi,

my problem is the following. I have a complex type that has one =
attribute that is based on an enumeration. The XML schema that I define =
is fixed, but a customer/user of that schema should be able to add items =
to the enumeration in an additional schema. 

Currently the approach is:
1) use an element reference in the complex type
2) have an abstract element of type string
3) define a simple type that contains the enum literals based on string
4) have another element, that is of simple type and has the abstract =
element as substitution group.
5) Users can extend the enumeration, by repeating step 3&4 in an own =
schema, and provide a different enumeration simpleType, which ideally =
includes the enum values of the original/parent simpleType.

Details to the steps are further down.
My questions are:
=> Is there a better way to do this? For example that a client/user =
don't have to repeat all existing enums, but can somehow merge them in =
with a union simple type?
=> How could a complex type definition look like that is an array of =
the enum, and is also capable of using the customer extension?

1) 
	<complexType name="BusinessInteractionValue">
		<complexContent>
			<extension base="ns3:EntityValue">
				<sequence>
					<element ref="ns0:baseState" minOccurs="0"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>

2)
	<element name="baseState" type="string" abstract="true"/>

3)
	<element name="state" type="ns0:RequestState" =
substitutionGroup="ns0:baseState"/>

4)
	<simpleType name="RequestState">
		<restriction base="string">
			<enumeration value="ABORTED"/>
			...
			<enumeration value="PARTIALLY_COMPLETED"/>
		</restriction>
	</simpleType>

5) -- in a separate schema --
	<simpleType name="ExtendedRequestState">
		<restriction base="string">
			<enumeration value="ABORTED"/>
			...
			<enumeration value="PARTIALLY_COMPLETED"/>
			<enumeration value="open.running.new1"/>
			<enumeration value="open.running.new2"/>
			<enumeration value="open.running.new3"/>
		</restriction>
	</simpleType>
	<element name="extendedRequestState" =
type="aek:ExtendedRequestState" substitutionGroup="om:baseState"/>

 _         __                _  _
//\ndreas.[|-bbert-[]/arroum(a)[|\|okia.com
           `-        `
   Andreas Ebbert-Karroum
      =A0=A0 Senior Software Design Engineer
                Nokia Networks Services / Middleware 
=A0=A0 phone: +49-211-94123928, fax: +49-211-9412-3838
=A0=A0 Heltorfer Stra=DFe 1, 40472 D=FCsseldorf, Germany 

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