An XML element has numerous potential attributes, most of them optional. In
a couple of cases, an attribute needs to be mandatory if another attribute
has a particular value. Is there a way of defining this in the document
schema?
For example the following might define a code fragment, consisting of text
with embedded <nl> elements. The fragment can be highlighted or not
(highlight="Y" or highlight="N"), and it can be flagged as private or not
(private="Y" or private="N"). There is an optional note attribute, which can
among other things provide a reason for the element to remain "private".
<xs:simpleType name="boolean">
<xs:restriction base="xs:string">
<xs:enumeration value="Y"/>
<xs:enumeration value="N"/>
</xs:restriction>
</xs:simpleType>
<xs:element name="nl">
<xs:complexType/>
</xs:element>
<xs:complexType name="fragment" mixed="true">
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element ref="nl"/>
</xs:choice>
<xs:attribute name="highlight" type="boolean"/>
<xs:attribute name="private" type="boolean"/>
<xs:attribute name="note"/>
</xs:complexType>
Is there any way to indicate in the schema that the "note" attribute is
mandatory IF private="Y"?
Coalescing the two attributes into one (e.g. "privatereason") and using a
value or no value as equivalent to a Boolean test is not feasible because
there are legitimate cases for a note when the element is not private.
Thanks for any ideas
T
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