[xsd-users] Code generation fails for schemas with large maxOccurs values

[david.r.moss at selex-comms.com]

Hi,

We're working with some third-party schemas that define large (not 
'unbounded') maxOccurs values for sequences. When compiling the schemas, 
no code is generated, although the build step reports no errors. A test 
schema that recreates the problem is as follows:

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd = "http://www.w3.org/2001/XMLSchema">
  <xsd:element name="bigList" >
    <xsd:complexType>
     <xsd:sequence>
       <xsd:element name="someItem" type="xsd:string" maxOccurs="9957"/>
     </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>

It is compiled for cxx-tree with no additional command line options using 
XSD version 3.0.0.

No code is generated when maxOccurs="9957" or greater and when it's a 
smaller "large" number the code generation takes a very (very) long time. 
I realise that in general this is bad practise as XML validation is slow 
with large bounds as mentioned in this previous post:

http://codesynthesis.com/pipermail/xsd-users/2007-February/000812.html

but surely the code generation should still work - we may well be stuck 
with these schemas. I've also tried the same example with XSD version 
3.1.0 and this time the limit seems to be  when maxOccurs="9949" or 
greater that no code is generated!

Cheers,
Dave.

Dave Moss 
SELEX Communications 
Grange Road 
Christchurch 
Dorset  BH23 4JE 
United Kingdom 
Tel: + 44 (0) 1202 404841 
Email: david.r.moss at selex-comms.com 


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