[OASIS Issue Tracker] Created: (EMIX-541) Change elementFormDefault in Schemas to "unqualified"

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Change elementFormDefault in Schemas to "unqualified"
-----------------------------------------------------

                 Key: EMIX-541
                 URL: http://tools.oasis-open.org/issues/browse/EMIX-541
             Project: OASIS Energy Market Information Exchange (eMIX) TC
          Issue Type: Improvement
            Reporter: Toby Considine
            Assignee: William Cox


Change elementFormDefault in Schemas to "unqualified"

In Emix, ItemBasewas conceived of as establishing a pattern of three values for all derived elements.

<xs:element name="itemDescription" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="itemUnits" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element ref="scale:siScaleCode" minOccurs="0" maxOccurs="1"/>

EMIX-conformant schemas (which include Power) use the pattern of derivation through restriction to specify the actual types. For example, Apparent Power restricts item choices as follows:

<xs:complexType name="PowerApparentType" mixed="false">
<xs:annotation>
<xs:documentation>Apparent Power measured in volt-amperes (VA)</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:restriction base="PowerItemType">
	<xs:sequence>
		<xs:element name="itemDescription" type="xs:string" fixed="ApparentPower"/>
		<xs:element name="itemUnits" type="xs:string" fixed="VA"/>
		<xs:element ref="scale:siScaleCode"/>
		<xs:element ref="voltage"/>
	</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>

While this pattern works well in a single schema, it fails if the derived type is in a separate schema from the archetype. In particular, each element generates the following error:
"rcase-NameAndTypeOK.1: The declarations' {name}s and {target namespace}s are not the same: restriction element is <xs:element name="itemDescription"> and base element is <xs:element name="itemDescription">."
http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/#rcase-NameAndTypeOK

This problem can be eliminated if the elementFormDefault for each Schema is changed to "unqualified". The current value is "qualified".
http://www.w3.org/TR/xmlschema-0/#ref50

This approach has been tested in XMLSpy and in code generated by Liquid Technologies.



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