The point here is NOT to have the site-generator (SSG) create complete index/overview pages that would then include all the titles+summaries, but instead to understand a <!--#include ...>, parse the document it points to, and be able to use the metadata for generating its indexes, tag clouds, or whatever BUT not include the document itself.

So the SSG will understand and use the per-page metadata to generate index-type pages but actual inclusion of content is delayed until it is requested from the web-server.

Because I have covered a huge number of categories over the years and many pages will be included in multiple indexes/overviews/tag-clouds, I do not want multiple index pages with copies of the same text.