Hi List,

Hello,


This is a re-post of my earlier posting, at Stefan's request, without the corporate boilerplate
that I inadvertently sent last time.  Sorry about that.

Bug 354574 logged at Stefan's request.

 
I have encountered a problem with schema object creation with lxml; the
problem relates to namespace used for the root element of the schema.
 
<snip>
>>> import lxml.etree
>>> et = lxml.etree.ElementTree(file=open('c:\\temp\\MySchema', 'r'))
>>> et
<lxml.etree._ElementTree object at 0x011B8AF8>
>>> xsd = lxml.etree.XMLSchema(et)
 
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    xsd = lxml.etree.XMLSchema(et)
  File "xmlschema.pxi", line 50, in lxml.etree.XMLSchema.__init__
(src/lxml/lxml.etree.c:120919)
XMLSchemaParseError: Document is not XML Schema
</snip>
 
Looking in subversion
(http://codespeak.net/svn/lxml/trunk/src/lxml/xmlschema.pxi), in the
XMLSchema class I see:
 
<snip>
 
            # work around for libxml2 bug if document is not XML schema at all
            #if _LIBXML_VERSION_INT < 20624:
            c_node = root_node._c_node
            c_href = _getNs(c_node)
            if c_href is NULL or \
                   cstd.strcmp(c_href, 'http://www.w3.org/2001/XMLSchema') != 0:
                raise XMLSchemaParseError, u"Document is not XML Schema"
</snip>
The schemas that I am using use this root element:
<xsd:schema xmlns:xsd="http://www.w3.org/2000/10/XMLSchema">
If I change them to <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> they validate. 
Can you explain why the earlier namespace definition is unacceptable?
Is there a workaround? 
The schemas are not built by my application, so changing them might be
an issue.

Cheers,

 

Kevin

hi,
(hope this is the right list for my question)

To set the XSL output encoding I normally use <xsl:output encoding="..."/> in the stylesheet.

At least in the Java based XSLT processors it is possible to set some attributes of xsl:output from the "outside" meaning when initializing or starting the transformation. So it is possible for example to overwrite any encoding specified in <xsl:output... with a different encoding.

Is there any way to do this with LXML?

The docs only have an example to set an XSLT parameter but not an XSLT processing configuration like the output encoding.

BTW, the example on http://codespeak.net/lxml/xpathxslt.html#xslt

>>> xslt_tree = etree.XML('''\
... <xsl:stylesheet version="1.0"
...     xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
...     <xsl:template match="/">
...         <foo><xsl:value-of select="$a" /></foo>
...     </xsl:template>
... </xsl:stylesheet>''')
>>> transform = etree.XSLT(xslt_tree)
>>> f = StringIO('<a><b>Text</b></a>')
>>> doc = etree.parse(f)

seems to miss an <xsl:param name="a"/> parameter. I have not checked if it works without it but I guess it would be good style to declare any incoming parameters if not for setting a default value, would it not?


thanks for any hints,
Christof

Hello Stefan,

Thanks for the speedy response, and for the workaround suggestions.

All the best,

Kevin