RE: [xml-dev] When to Validate XML Guidelines

["Bullard, Claude L (Len)" <clbullar@ingr.com>]

Validate on Request.  It is the right of every 
node to request a validation if the local node 
policy requires it.   A message for which no 
validation artifact is provided is handled 
locally.

A rule of thumb is validate on creation 
either through validation artifacts such as 
schema types (pick one) or correct by 
construction process.  Then validation 
rules depend on the contract for the transaction. 
A trusted partner may not require validation 
but the trust is contingent on criticality of 
the message (affect on local process or 
distribution).   The local nodes knows its 
own rules for handling messages of the 
type encountered and can request validation.

No size fits all.