Re: [ebxml-dev] Core Components

[Duane Nickull <duane@xmlglobal.com>]

Steve Capell wrote:
> 
> Shouldn't your US and French Invoice total element both provide a
> reference to the same CC UID?
>>>>>>>>>>>>>

Steve:

Yes - you are correct but with an explanation due.  I personally use a
system to attach the UID via a "fixed" attribute to each element. 
Therefore,  the XML instance would still be written as:

<InvoiceTotal currency="USD" displaySign="$">12.00</InvoiceTotal>

however,  when a validating parse is done by calling a DTD containing
the following:

<!ELEMENT InvoiceTotal (#PCDATA)>
<!ATTLIST InvoiceTotal UID "urn:uid:com-xmlglobal-registry:ubl81002"
#FIXED
                       currency CDATA #REQUIRED
		       displaySign ( $ | &#8364; | UKP ) #REQUIRED
                       >

the XML instance fragment is available as:

<InvoiceTotal UID="urn:uid:com-xmlglobal-registry:ubl81002"
currency="USD" displaySign="$">12.00</InvoiceTotal>

and you can write handlers to use the UID attribute value.

For implementation,  I would state that it is more efficient to use the
FIXED attribute mechanism so you have access to the UID at deisgn time,
yet do not have to incur the overhead during runtime by turning the
validation mechanism off on your parser.

Duane
- 
VP Strategic Relations,
Technologies Evangelist
XML Global Technologies
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