vjethava@g... wrote:
> 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>

PCDATA is for element character data content. For attributes just use 
CDATA. You also need to specify if a value is compulsory (#REQUIRED)
or optional (#IMPLIED), eg

<!ATTLIST CAR TYPE CDATA #REQUIRED PRICE CDATA #IMPLIED>

> <!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"

Not in an XML DTD. Something similar is possible in SGML (CONREF).
But why do you want to do this? It's only necessary to give information
once.

> 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.

No. That's something you do in your processing language (eg XSLT). But
using a Schema language may help.

///Peter
-- 
XML FAQ: http://xml.silmaril.ie/