[xsde-users] Re: ignoring parts of the schema - and referenced
eric.broadbent at csr.com
Wed Nov 30 20:47:56 EST 2011
And finally, to close the topic: removing validation allows the unexpected attribute to pass without complaint.
On Nov 30, 2011, at 3:39 PM, Eric Broadbent wrote:
> Just an update - I tried the method of creating the parser skeleton/implementation code for this "extension" schema and building it into the application, in hopes that parser would recognize the attribute if an element's attributes were extended like this.
> However I still get "unexpected attribute encountered".
> So I'm going to try turning off validation next.
> On Nov 29, 2011, at 11:02 PM, Eric Broadbent wrote:
>> Hi Boris,
>> thanks for the reply - sorry my previous query was vague.
>> I found an example of this kind of namespace reference in Office documents.
>> Here is the root document element from a random Word docx file on my computer:
>> <w:document xmlns:mo="http://schemas.microsoft.com/office/mac/office/2008/main"
>> According to specs I am able to see, the "document" element does not have any attributes.
>> The document tag contains references to other schemas necessary to specify child elements, and then there are two attributes in the "ve" namespace:
>> In order to be able to parse these attributes, the parser must know about the "markup-compatibility" schema, however the child elements do not use this schema - it's only necessary to interpret these extra attributes.
>> So unless one processes the "markup-compatibility" schema with XSD and generates parsers for it - these attributes will be "unexpected" and declared invalid.
>> Is this the only way around these kind of "extension" attributes?
>> Thanks for your help,
>> On Nov 29, 2011, at 10:17 AM, Boris Kolpackov wrote:
>>> Hi Eric,
>>> Eric Broadbent <Eric.Broadbent at csr.com> writes:
>>>> The problem seems to be that I have not generated parsing code for all the
>>>> possible schemas that can be referenced via attributes.
>>>> It seems that there can be "optional" elements, which essentially allow
>>>> namespaces to be extended.
>>>> This looks something like this - appearing in any given element attribute
>>>> where "foobar" is an attribute in the schema XMLSchema-foo, and "bar" is yet
>>>> another namespace represented by another schema. The use of the "foobar"
>>>> attribute to give meaning to the "bar" namespace is dependent on the ability
>>>> to interpret the semantics of the "foo" schema.
>>>> As far as my application is concerned, I do not need to do anything with
>>>> these attributes or namespaces, and I would like the parser to ignore them.
>>>> However, since this kind of namespace reference is dynamic, perhaps there is
>>>> no opportunity to tell the parser to skip over these attributes - in the
>>>> same way that we can tell it to skip over elements. Therefore I am not sure
>>>> how to deal with this situation - except to have pre-processed any possible
>>>> "optional" schema beforehand and built parsers for it.
>>>> My question is - is there any way to skip over unknown element attributes
>>>> like this that are referring to other schemas that I have no handlers for
>>>> (and no need for)?
>>> I am having a hard time understanding how the "extension schemas" are
>>> working in your setup without seeing some concrete examples. Generally,
>>> though, you can skip any valid element or attribute by simply not
>>> providing a parser for it. By valid I mean that it is valid for such
>>> an element/attribute to appear in the content, per the schema.
>>> Normally, schema extensions are arranged using the xsd:any or
>>> xsd:anyAttribute wildcards. By default their content will be ignored
>>> but the namespaces of the elements/attributes will still be checked.
>>> The only way to ignore an invalid element or attribute (i.e., one
>>> that is not allowed by the schema) is to disable validation.
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