RE: intersecting schema with application-specific validation

["David E. Cleary" <davec@progress.com>]

XML Schema has left you two ways to do this. I detail them in an upcoming
article for XML Journal that is available on the web at:

Article:  http://www.sys-con.com/xml/archives/0205/cleary/index.html
Listings: http://www.sys-con.com/xml/source/2-5/code.cfm?Page=25

Another alternative is the Schema Adjunct Framework, which defines rules for
creating a separate adjunct (file) that contain these application specific
validations. You can find more info on SAF at
http://www.extensibility.com/saf.

David Cleary
Progress Software


-----Original Message-----
From: sabba [mailto:sabbadin@infinito.it]
Sent: Thursday, May 03, 2001 5:42 AM
To: XML-DEV
Subject: intersecting schema with application-specific validation


hi, i'm developing an xml based application where i need to validate a
"rather" complicated structure.
I'm happy that w3c schema have right yesterday (2nd may '01) become a
reccomendation,
still i think i won't be able to express all validations i need to express
using just an xml schema, moreover i need to generate a "new instance" based
on this "schema" , and so i'll need to put more info "somewhere" since an
xmlschema leaves you, evidently,  too much freedom in this "new instance"
process.
The point where my doubts are is that , since schema won't be enough , where
should i put extra "application specific" validation info (a custom xml
syntax ?) . how can i apply both validations in a consistent manner that
won't lead to spaghetti code.
if there is any standard, approach , best practice you are aware ? i'd like
to know.
thank in advance.