[prev in list] [next in list] [prev in thread] [next in thread] 

List:       xmlbeans-dev
Subject:    Re: A New approach for XPath using Namespace
From:       David Waite <mass () akuma ! org>
Date:       2004-06-23 17:14:07
Message-ID: BC8FB064-C538-11D8-B8AD-000A95C89D86 () akuma ! org
[Download RAW message or body]

On Jun 23, 2004, at 10:58 AM, nn wrote:

> Sorry forgetting to add prefix in the XPath (that is actually what I 
> don't
> like. It is too redundent. I want to use simple XPath without prefix
> assuming default namespace is the targetNamespace of the xsd file of 
> the
> target document).
Yes, but XPath 1.0 specifically says that this isn't the case:

http://www.w3.org/TR/xpath#node-tests

A QName in the node test is expanded into an expanded-name using the 
namespace declarations from the expression context. This is the same 
way expansion is done for element type names in start and end-tags 
except that the default namespace declared with xmlns is not used: if 
the QName does not have a prefix, then the namespace URI is null (this 
is the same way attribute names are expanded). It is an error if the 
QName has a prefix for which there is no namespace declaration in the 
expression context.

this changes in XPath 2.0 (http://www.w3.org/TR/xpath20/#node-tests); 
you can define what the deafult element/type namespace is as another 
element of the expression context:

A QName in a name test is expanded into an expanded-QName using the 
in-scope namespaces in the expression context. It is a static error 
[err:XP0008] if the QName has a prefix that does not correspond to any 
in-scope namespace. An unprefixed QName, when used as a name test on an 
axis whose principal node kind is element, has the namespace URI of the 
default element/type namespace in the expression context; otherwise, it 
has no namespace URI.

Of course, XPath 2.0 isn't finished yet :)

-David Waite

On Jun 23, 2004, at 10:58 AM, nn wrote:


<excerpt>Sorry forgetting to add prefix in the XPath (that is actually
what I don't

like. It is too redundent. I want to use simple XPath without prefix

assuming default namespace is the targetNamespace of the xsd file of
the

target document).

</excerpt>Yes, but XPath 1.0 specifically says that this isn't the
case:


http://www.w3.org/TR/xpath#node-tests


A QName in the node test is expanded into an expanded-name using the
namespace declarations from the expression context. This is the same
way expansion is done for element type names in start and end-tags
<bold>except that the default namespace declared with xmlns is not
used: if the QName does not have a prefix, then the namespace URI is
null</bold> (this is the same way attribute names are expanded). It is
an error if the QName has a prefix for which there is no namespace
declaration in the expression context.


this changes in XPath 2.0 (http://www.w3.org/TR/xpath20/#node-tests);
you can define what the deafult element/type namespace is as another
element of the expression context:


A QName in a name test is expanded into an expanded-QName using the
in-scope namespaces in the expression context. It is a static error
[err:XP0008] if the QName has a prefix that does not correspond to any
in-scope namespace. An unprefixed QName, when used as a name test on
an axis whose principal node kind is element, has the namespace URI of
the default element/type namespace in the expression context;
otherwise, it has no namespace URI.


Of course, XPath 2.0 isn't finished yet :)


-David Waite

[prev in list] [next in list] [prev in thread] [next in thread]