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picking value of one attribute based on a child elements attribute? XPath?

From: vjethava@-----.---
To: NULL
Date: 2/28/2006 10:59:00 PM
Hi,

I'm relatively new to xml. I want to have a xml element of the form:

<!ELEMENT CAR (MAKE, COMPANY)>
<!ATTLIST CAR
                           TYPE   PCDATA
                           PRICE  PCADATA>

<!ELEMENT COMPANY (HQ, COMPANY_TYPE)>

Is there a way such that CAR/TYPE has the same value as
CAR/COMPANY/COMPANY_TYPE either using DTD or a schema . For example,
whenever,

CAR/COMPANY/COMPANY_TYPE = "PRICEY"
then,
CAR/TYPE = "PRICEY"

I think something like XPath is needed but am not sure how to go about
getting this. Can I use XPath inside XML elements to point to value of
other elements.

Vinay



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