LogTransformer
The Log Transformer allows fragments of XML to be written to an external file to aid in debugging
sitemap pipelines. A typical use of LogTransformer would be
<map:transformers default="xslt">
<map:transformer name="log" src="resource://lib/transforming/LogTransformer"/>
...
</map:transformers>
<map:pipelines>
<map:pipeline>
<map:match pattern="**.html">
...
<map:transform type="log">
<map:parameter name="logfile" value="context://logs/logfile-aggr.log"/>
<map:parameter name="append" value="yes"/>
<map:parameter name="filter" value="//*[local-name() = 'p'][2]"/>
</map:transform>
...
</map:match>
</map:pipeline>
</map:pipelines>
where
- logfile — defines the logfile to use (must have
correct permissions set).
- append — defines whether the log data is appended
to the end of the file (yes) or a new file is created each time (no).
- filter — provides a means to restrict what is
output to the log file using an XPath expression. For example, the example above would just
output the second paragraph ( <p>
) of the XML in the pipeline at that
point. Note that the expression should be "namespace-neutral", that is, only local names should be
used.
The example above might give the following (from the documentation home page):
==============================================================================
<t:p>Installation is very simple — download the latest version
<link:link type="uri" ref="downloads/paloose-latest.tgz">here</link:link>
and then follow <link:link type="uri" ref="documentation/install.html">these
(brief) instructions</link:link>.</t:p>
Copyright 2006 – 2017 Hugh Field-Richards. All Rights
Reserved.