XML::XPath to read multiple files

I am trying to extend an application that uses XML::XPath to extract
fragments of information from a small XML file.

The extension will cause it to summarise this information from
MANY XML files.  Doing the obvious thing gets me a working
system, but it is slow.

Currently, I am analysing each file in turn using the existing information
extraction code, and ths is creating an XML::XPath object to do the business.

I realise that this is not a good way to do things, since the README
for XML::XPath says...

    It is very much recommended that you use only 1 XPath object
    throughout the life of your application.

But it is not obvious what I should do instead!

Yet this must surely be a common thing to do.   Musn't it?

So can someone give me (or point me to) an example of how
process a number of files with only a single XPath object?

Thanks...

Robert.
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