[DFDL-WG] Validation of min/mxOccurs

[Tim Kimber]

The specification is not entirely clear on a the following points
a) If the input document contains too many occurrences of an element, 
should that be treated as a validation error, or a processing error?
Section 5.2.1 says "It is a parse error when an array is found to have a 
number of occurrences not conforming to the minOccurs and maxOccurs 
constraints in the absence of a default value specification.
Note that specifically, this is not a validation error, it is a processing 
error"
Points to note:
- When unparsing, the infoset might omit an element which has minOccurs > 
0. Should that be reported as a validation error, or a processing error?
- When unparsing, the infoset might omit an entire group. If all of the 
elements in the omitted group were optional, should this be considered an 
error ( because groups are implicitly required ) or not?
- When parsing an unordered group, if the input document contains more 
than  maxOccurs occurrences of one of the members, is that a processing 
error or a validation error? The specification seems to imply that it is a 
validation error, but that seems inconsistent with section 5.2.1

It may be necessary to include a section which specifies how the DFDL 
processor should perform schema validation.

regards,

Tim Kimber, Common Transformation Team,
Hursley, UK
Internet:  kimbert at uk.ibm.com
Tel. 01962-816742 
Internal tel. 246742






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