Using XML editor to systematically change / edit IPE file?

I have created IPE files with dozens of diagrams by importing PDFs created
with another software.

I want to edit them and e. g. remove all objects (same size, but on
different positions on all pages) like

<path matrix="0.5 0 0 0.5 11.0412 -31.1381" fill="1" fillrule="wind">
316 797 m
406 797 l
406 875 l
316 875 l
316 797 l
h
</path>

or change then line width (pen) for all objects like (=same size and
properties, but different positions)
<path matrix="0.5 0 0 0.5 37.9741 -32.7541" stroke="0" pen="1" cap="2">
311.5 791.5 m
311.5 879.5 l
411.5 879.5 l
411.5 791.5 l
311.5 791.5 l
</path>

to 0.5 and so on.

As my knowledge of regular expressions and shell scripting is very very
limited, I wonder if there are "more intuitive" ways for unexperienced users
to edit such information in a XML file.
I've seen that there are lots of XML editors which can display the contents
of a XML file in a structured (sometimes even "graphical") way.

Is there one (available for MacOS X, or Windows XP) which has a GUI where I
can browse the contents of an XML file and also filter only those elements
with certain properties and find/replace text in (only!) those elements or
completely delete them?

Does anyone here use an XML editor with GUI to edit IPE files? 

Kind regards

Martin
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