- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 08 May 2000 14:52:50 +0100
- To: "gmacri@libero.it"<gmacri@libero.it>
- Cc: www-xml-schema-comments@w3.org
"gmacri@libero.it"<gmacri@libero.it> writes:
> In this example there is a definition of a key:
> <xs:element name="car">
> <xs:complexType model="empty">
> . . .
> <xs:attribute name="regRef" type="dt:integer"/>
> <xs:attribute name="regState" type="twoLetterCode"/>
> </xs:complexType>
> </xs:element>
> </xs:complexType>
>
> <xs:key name="carRef" >
> <xs:selector>.//car[@regRef]</xs:selector>
> <xs:field>@regRef</xs:field>
> <xs:field>@regState</xs:field>
> </xs:keyref>
> </xs:element>
>
> If I want define a key similar to the key defined up, can I use as
> content of <field> a name of element that not is descendant of "car"
> but is a name of element that is, for instance, the child of an
> ancestor of car ?.
> Thank you for all.
Yes. As the spec. says [1], the things picked
out by <field> are not constrained to lie within the element picked
out by <selector>, and no other constraint as to locality is imposed.
ht
[1] http://www.w3.org/TR/xmlschema-1/#Identity-constraint_Definition_details
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2001, part-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
URL: http://www.ltg.ed.ac.uk/~ht/
Received on Monday, 8 May 2000 09:53:00 UTC