I just joined this list so I thought I'd post something. I don't know
exactly what you're looking for in (2), but this is (1). I say if you
want to add the nodes that are connected to nodes you are keeping, just
tinker with the matches.
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:param name="nodelist"/>
<xsl:variable name="nodeids" select="concat(' ',$nodelist,' ')"/>
<xsl:template match="@*|node()">
<xsl:copy><xsl:apply-templates select="@*|node()"/></xsl:copy>
</xsl:template>
<xsl:template match="node[$nodelist and
not(contains($nodeids, concat(' ',@id,' ')))]"/>
<xsl:template match="edge[$nodelist and
not(contains($nodeids,concat(' ',@to,' ')) and
contains($nodeids,concat(' ',@from,' ')))]"/>
</xsl:stylesheet>
This would look a little neater in 2.0, but I don't know a better way
for libxslt.
You'd run this like:
xsltproc --stringparam nodelist "alpha beta" foo.xsl foo.xml
Have fun.
sdc
On Fri, 2005-06-17 at 09:44 -0700, Ramon Felciano wrote:
Hello --
I'm trying to do parameterized XSLT-based filtering to strip out
unwanted structure from an XML file. The XML file represents a graph
data structure along with some other metadata. Conceptually I want to
extract a subgraph from this data structure, but want to do so in an
upwards-compatible way such that any additional tags in the XML are
carried over to the resulting document. For example, given this XML
file:
<graph>
<node id="alpha"/>
<node id="beta"/>
<node id="delta"/>
<node id="gamma"/>
<edge from="alpha" to="delta"/>
<edge from="alpha" to="beta"/>
<edge from="alpha" to="gamma"/>
<edge from="beta" to="beta"/>
<mymetadata id="123"/>
</graph>
Given the above simple graph data structure, I want to produce a
filtered version that only includes node elements (ideally both node and
edge elements) that match a given set of input parameters, as well as
any other tags that might be included (e.g. the mymetadata tag). I'd
ideally like to issue a call like this so that I integrate this w shell
scripts:
xsltproc mytransform.xslt myfile.xml --param nodelist "alpha,beta"
And get this back:
<graph>
<node id="alpha"/>
<node id="beta"/>
<edge from="alpha" to="beta"/>
<edge from="beta" to="beta"/>
<mymetadata id="123"/>
</graph>
I have two questions:
1. What is the best way to create a pattern match that is parameterized
based on the incoming nodelist? I'd like to flexible about delimeters
(e.g. have both "alpha,beta" and "alpha , beta" work). I've tried
playing with tokenize from EXSLT but can't figure how to use the
resulting tokens to implement the filtering in a single-pass.
2. Is there a way to implement this to also include the alpha-gamma edge
and the gamma node, based on the partial edge match to "alpha"? I know
how to do this w multiple passes (e.g. by marking the edges, then the
nodes, then filtering) but was wondering if there was a nice one-pass
functional approach I've missed.
Thank you in advance for your time.
Ramon
_________________________________
Ramon M. Felciano
INGENUITY Systems, Inc.
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