NSXMLDocument objectByApplyingXSLT with XSL Include_问答_开发者

NSXMLDocument objectByApplyingXSLT with XSL Include

开发者 https://www.devze.com 2022-12-27 16:26 出处：网络

I\'m having some trouble with XSL-processing when there are stylesheets that include other stylesheets relatively.

相关专题：cocoa xml xslt

I'm having some trouble with XSL-processing when there are stylesheets that include other stylesheets relatively.

(the XML-files may be irrelevant but are included for completeness - code is at the bottom).

Given the XML-file:

<?xml version="1.0" ?>
<famous-persons>
<persons category="medicine">
  <person>
   <firstname> Edward   </firstname>
   <name>      Jenner   </name>
  </person>
</persons>
</famous-persons>

and the XSL-file:

<?xml version="1.0" ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    version="1.0">
  <xsl:include href="included.xsl" />
</xsl:stylesheet>

referencing this stylesheet in the same directory called included.xsl:

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    version="1.0"> 
  <xsl:template match="/">
     <html><head><title>Sorting example</title></head><body>
    </body></html>
  </xsl:template>
</xsl:stylesheet>

how can I make it that the following code fragment:

NSError *lError = nil;
NSXMLDocument *lDocument = [ [ NSXMLDocument alloc开发者_StackOverflow ] initWithContentsOfURL:
                                        [ NSURL URLWithString: @"file:///pathto/data.xml" ]
                                    options: 0
                                    error: &lError ];

NSXMLDocument *lResult = [ lDocument objectByApplyingXSLTAtURL: [ NSURL URLWithString: @"file:///pathto/style.xsl" ]
                                    arguments: nil
                                    error: nil ];

does not give me the error:

I/O warning : failed to load external entity "included.xsl"
compilation error: element include
xsl:include : unable to load included.xsl

I have been trying all sorts of options. Also loading XML documents with NSXMLDocumentXInclude beforehand does not seem to help. Specifying the absolute path to the to-be-included XSL file works flawlessly.

Is there any way to make the XSL processing so that a stylesheet can include another stylesheet in its local path?

I had this problem too. In the end I wrote the SWXSLTransform class which is included in my SWXMLMapping framework: https://github.com/oriontransfer/SWXMLMapping

The main issue is that under the hood, -[NSXMLDocument objectByApplyingXSLTAtURL:...] is actually not passing the URL to libxslt. Instead, it loads the data pointed at that URL, and feeds the data into libxslt without any base URI. Because of this, the current working directory becomes the base URI - you can use <xsl:include href="..."> where href is relative to the current working directory... Not very useful!

As far as I can tell, the NSXMLDocument interface is completely broken, and there doesn't seem to be any way to fix it. I've filed a bug report.