[erlang-questions] Problem with XML validation using xmerl_xsd:validate().

bryan rasmussen <>
Fri Jan 2 10:45:37 CET 2009


The string datatype in XML Schema can be zero length. So by default
the text value of an XSD string is optional.

Thus from what I can see of your example, in my gmail, is valid. If
you have valid results from other validating parsers I would assume it
is likely valid.

I tried it with XSV just to see if there was something I overlooked.
passed fine.
Looks like a bug.

Cheers,
Bryan Rasmussen




On Tue, Dec 30, 2008 at 2:15 PM, Robert Raschke <> wrote:
> 2008/12/30 Andrey Sedinin <>:
>> Hi
>>
>> Of course i have tested this case:
>>
>> <status></status>
>>
>> It does not work too (or it work with the same result :).
>>
>> But in XML it is equivalent:
>>
>> <status></status> =:= <status/>
>>
>> But any way -- thank you for your guessing.
>
> I don't know very much about XML and schemas, but is it actually
> possible to distinguish an empty text content from a non-existant one
> (that would be kind of like "" == NULL)? I mean the text, not the
> presence of the node itself.
>
> If empty == non-existant then I don't think you can easily represent
> that in a schema. But, as I say, I am not an expert.
>
> Do schemas not allow you to state that text content of a node is optional?
>
> Robby
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