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I wish to create an XML document in which one of its elements must be
defined with one of two known attributes, but not both.
For example, I would like to define a "socketHandler" element as follows:
<xs:element name="socketHandler">
<xs:complexType>
<xs:attribute name="hostName" type="xs:string"/>
<xs:attribute name="hostAddress" type="xs:string"/>
<xs:attribute name="port" type="xs:int" use="required"/>
</xs:complexType>
</xs:element>
but I only want a user to be able to define either a hostName attribute
(e.g., hostName="<servername>") or a hostAddress (e.g.,
hostAddress="<IP_address>") attribute, but not both. It appears that the
<xs:choice> construct accomplishes this for elements. Is there a
functional
equivalent for attributes, or is there a better way to approach this?
--
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