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Within header.inc I would like to also include more SSI to dynamically determine if an element should be of the active class. It looks like this: <!--#if expr="$DOCUMENT_NAME = index.html" --> class="active" <!--#endif -->. This works if the code is directly inside index.html, but not if the include is garned from SSI within index.html.
I would really appreciate your help with this.
Note also that if your Last-Modified dates are important to you -- if you are concerned with cacheability management -- you may want to look into using XBitHack Full and setting the Group x bit as well.
I'm OK with it as .html though so problem solved!