XPath Query Exressions and Quote Characters

[C Drozdowski <c.d@xxxxxxxxxxxxx>]

I've got a problem with quote characters and building XPath query 
expressions (PHP 5.0.3). What do I need to do to get them to work? I've 
tried various encoding functions but cannot figure it out.

Given this expression, if $id contains one or more double quotes, an 
error is thrown.

$query = '//book/chapter' . '[@xml:id="' . $id . '"]';

Given this expression, if $id contains one or more single quotes, an 
error is thrown.

$query = "//book/chapter[@xml:id='$id']";

I need to be able to build an exression that contains either double or 
single quotes in the search regarding of how I programatically build 
the expression.

Any insight would be appreciated.

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