I'm new to these programs, having come from extensively using MSXML2
utilities in a Windows environment. So while experienced with XML and
XSLT, I am pretty green with libxml2 and libxslt.
What I'm attempting to do is manage a website by using XML tools to
standardize web pages and to prepare a site map. In Windows, I used the
DOM to open the XHTML files, check for and add CSS references and
reconcile the internal links between pages in the website. I started by
trying to do the same things with libxml2, but, unfortunately, libxml2
was frustrating me by either (in HTML mode) not properly closing the
empty elements like <link> and <meta>, or (in XML mode) closing the
empty elements but adding redundant xmlns attributes to the <html>
element as well as redundant <?xml ?> and <!DOCTYPE declarations.
After I gave up on libxml2 for this task, I decided that I could do the
same thing with a stylesheet. The only remaining problem there is that
libxslt is adding unwanted attributes to my <a> elements. In one web
page, I am using intra-page links to named <a> elements. When I run the
XHTML file through libxslt or xsltproc, those same <a> elements have the
name attribute and an extra id attribute with the same value. I wouldn't
really care about this except that the next time I try to parse the file
for updates, the parser chokes, in an unrecoverable way, on what it
calls redundant attributes.
I am using the Python bindings (libxml2.py, libxslt.py). I would be
happy with a workaround. I tried to work with the result object of the
transformation, which seems to be a somewhat crippled xmlDoc object. I
tried to xpathEval() to find the broken <a> tags, but xpathEval()
returns no nodes. I can get to the <html> node with result.children, but
I can't get it with result.xpathEval("/html")
I can reproduce the problem with the two simple files listed below. Note
the last two templates in the xsl file are the special case for
processing the <a> element where the problem occurs. Run the example
with the following command:
xxx$ xsltproc --html demo.xsl demo.htm
I would appreciate any advice.
Thanks,
Chuck Jungmann
demo.xml:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=ISO-8859-1" />
<title>Demo libxslt Error</title>
</head>
<body>
<h1>Demo libxslt Error</h1>
<p>
Here's a <a href="bogusURL.htm">bogus link</a>
with href attribute that should be changed
</p>
<p>
Here's a <a name="bogusName">named link</a>
that is improperly copied.
</p>
</body>
</html>
demo.xsl:
<?xml version="1.0"?>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns="http://www.w3.org/1999/xhtml";
xmlns:html="http://www.w3.org/1999/xhtml";
exclude-result-prefixes="html">
<xsl:output method="xml"
doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
version="1.0"
indent="yes"
omit-xml-declaration="yes"
encoding="ISO-8859-1"/>
<xsl:template match="/">
<xsl:apply-templates select="*" />
</xsl:template>
<xsl:template match="html">
<html>
<xsl:apply-templates
select="child::node()"
mode="copy" />
</html>
</xsl:template>
<xsl:template match="node()" mode="copy">
<xsl:choose>
<xsl:when test="self::*">
<xsl:element name="{name()}">
<xsl:apply-templates select="@*"
mode="copy" />
<xsl:apply-templates
select="child::node()"
mode="copy" />
</xsl:element>
</xsl:when>
<xsl:when test="self::text()">
<xsl:value-of select="." />
</xsl:when>
<xsl:when test="self::comment()">
<xsl:comment>
<xsl:value-of select="." />
</xsl:comment>
</xsl:when>
<xsl:when test="self::processing-instruction()">
<xsl:processing-instruction
name="{name()}">
<xsl:value-of select="."
mode="copy" />
</xsl:processing-instruction>
</xsl:when>
</xsl:choose>
</xsl:template>
<xsl:template match="@*" mode="copy">
<xsl:attribute name="{name()}">
<xsl:value-of select="." />
</xsl:attribute>
</xsl:template>
<xsl:template match="a" mode="copy">
<xsl:element name="a">
<xsl:apply-templates
select="@*[not(name()='href')]"
mode="copy" />
<xsl:apply-templates
select="@href"
mode="copy" />
<xsl:apply-templates
select="child::node()"
mode="copy" />
</xsl:element>
</xsl:template>
<xsl:template match="a/@href" mode="copy">
<xsl:attribute name="href">
<xsl:value-of
select="concat('boguspath/', .)" />
</xsl:attribute>
</xsl:template>
</xsl:stylesheet>
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