- From: Hewko, Doug <Doug.Hewko@ccra-adrc.gc.ca>
- Date: Thu, 6 Sep 2001 10:31:17 -0400
- To: "'www-xml-schema-comments@w3.org'" <www-xml-schema-comments@w3.org>
In schemas, how do you ensure that a IDREF (identifier reference)
corresponds to a particular ID? According to the book I am reading, a
identifier reference will "ensure that the value of an XML attribute matches
a previously defined unique identifier" ("XML, your visual blueprint for
building expert web pages", by meranGraphics and IDG Books, page 106)
An example of an ID declaration that they provide is:
- example:
- <AttributeType name="product_code" dt:type="id" />
- <ElementType name="product" content="eltOnly" model="closed">
- <attribute type="product_code"/>
- </ElementType>
While the IDREF is:
- <AttributeType name="bestseller" dt:type="idref" />
- <ElementType name="name" content="eltOnly" model="closed">
- <attribute type="bestseller"/>
- </ElementType>
There does not appear to be anything saying that "bestseller" must match the
entries in "product".
Received on Thursday, 6 September 2001 10:30:47 UTC