Lucene querybean - cocoon 2.11

[Peter Sparkes]

Hi,

I am using  a querybean to generate a Lucene index.

The sitemap pattern is ( adapted from the sample block :

<map:match pattern="create.html">
                <map:call function="indexCollection">
                    <map:parameter name="screen" value="screen/indexer"/>
                    <map:parameter name="lucene-directory" 
value="{global:lucene-directory}"/>
                    <map:parameter name="lucene-analyzer" 
value="{global:lucene-analyzer}"/>
                    <map:parameter name="lucene-merge-factor" value="10"/>
                    <map:parameter name="lucene-create-index" value="false"/>
                    <map:parameter name="lucene-content" 
value="cocoon:/prepare4indexing/"/>
                    <map:parameter name="content-directory" value="../BB/xml"/>
                    <map:parameter name="include-pattern" value=".xml$"/>
                    <map:parameter name="result-directory" value=""/>
                    <map:parameter name="result-suffix" value=""/>
                </map:call>
 </map:match>

Please:

1. What's the $ in <map:parameter name="include-pattern" value=".xml$"/>  for?
2. Is there any way of excluding a file from being indexed on the value of one 
of its attributes?

Thanks

Peter