What version of XML Schema do you use? AFAIK, XSD 1.1 offers some
support in this direction, but I've stuck with 1.0 at the moment
and don't know if they will meet your requirements.

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

XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list>
EasyUnsubscribe <-list/696613>
(by email <>)

--
___________________________________________

   C302 IT-Kompetenzzentrum Datenerhebung
   und Aufbereitung

   michael.schaefer@xxxxxxxxxxx
   www.destatis.de

   DESTATIS
   wissen.nutzen. | Statistisches Bundesamt