The HTML converter necessarily uses a post-processor, which re-parses the
output of the tt(yodl) program. The post-processor is necessary for a variety
of reasons: the HTML output is split into several files, a table of contents
is created, labels and references to labels are resolved.

The post-processor is a program tt(yodl2html-post) and is automatically
activated when the shellscript tt(yodl2html) is used. I therefore strongly urge
you to convert Yodl documents to HTML using this script.

The usage of the post-processor has one important drawback. The tt(yodl)
program em(sec) places tags for the post-processor in its output. The
post-processor takes actions according to the tags.

The tags start with tt(.yodltagstart.) and end with tt(.yodltagend.) (though 
in upper case, guess why I typed them here in lowercase?).  Therefore, you
bf(cannot) put these strings in a Yodl document that should be converted to
HTML. The tags would however be harmless in other output formats. (If this 
setup that uses tags proves to be a problem, I'll implement a way around it. 
Besides, the tags can be configured in the top-level tt(Makefile) when 
installiong the Yodl package.)
