WebCache ESI Environment Bug

I found a really stupid and frustrating but with the WebCache ESI Environment functionality.
I have an ESI environment file containing key/value pairs (in a flat XML structure).
I have another page which looks up values in this file, using the <esi:environment> and <esi:vars> tag to do the lookup.
The bug concerns whitespace in the ESI environment file. Specifically, if you have the following at the top of the file:
<?xml version="1.0" ?>
...it will not work. However, it does work if you have:
<?xml version="1.0"?>
i.e. no space before the last '?' character.
XML parsing should be able to cope with this kind of extra whitespace. This is a serious and frustrating bug.
Francis

The XML parser currently used in Web Cache is not a general-purpose XML parser for better performance. It may be switched to a general-purpose one for limitations like this in the near future.

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(Fig.2)
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(Fig.4)
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