Whitespace in schema documents

[Allen Brookes <ab...@roguewave.com>]

Hi,

I'm using the xerces xs package to parse a schema.  If I have any whitespace
before the prolog xs fails to parse the document.  Whitespace anywhere else
doesn't seem to cause any problems.  Shouldn't whitespace be allowed before
the prolog?

Thanks,
Allen

---------------------------------------------------------------------
To unsubscribe, e-mail: xerces-j-user-unsubscribe@xml.apache.org
For additional commands, e-mail: xerces-j-user-help@xml.apache.org

Re: Whitespace in schema documents

[Steven Ihde <si...@cs.stanford.edu>]

On Thu, Sep 09, 2004 at 02:13:53PM -0700, Allen Brookes wrote:
> Hi,
> 
> I'm using the xerces xs package to parse a schema.  If I have any whitespace
> before the prolog xs fails to parse the document.  Whitespace anywhere else
> doesn't seem to cause any problems.  Shouldn't whitespace be allowed before
> the prolog?


No.  Some older parsers allowed this but it is not permitted according
to the spec.  Here is the production for "document" from the spec:

http://www.w3.org/TR/REC-xml/#NT-document

If you chase the links down, there is no white space allowed before
'<?xml'.  

The spec also says in section 2.1:

    2.1 Well-Formed XML Documents

    [Definition: A textual object is a well-formed XML document if:]

       1. Taken as a whole, it matches the production labeled document.

This seems to make it clear that ignoring leading whitespace is not
permissible.  

Everywhere whitespace can appear in a document, it is explicitly
allowed by the grammar, represented by the production named "S":

http://www.w3.org/TR/REC-xml/#NT-S

-Steve


-- 
Steven C. Ihde <si...@cs.stanford.edu>
PGP Key ID: 0x7793756D
PGP Fingerprint:  DC 55 8B CA 50 8B DD 75  67 45 96 4D FF 42 8A 6C

---------------------------------------------------------------------
To unsubscribe, e-mail: xerces-j-user-unsubscribe@xml.apache.org
For additional commands, e-mail: xerces-j-user-help@xml.apache.org