[mod_filter] help configuring filter providers

This seems applicable to any filtering module that requires
configuration, though I am primarily interested in mod_sed,
mod_substitute or mod_line_edit.
Furthermore, I run into the same issue using the deprecated directives
from core: [AddOutputFilterByType] and [SetOutputFilter].

Currently mod_filter seems to act in this way: Upon a successful match
to a filter-name in the [FilterProvider] directive, all directives of
the corresponding filter provider (mod_sed, mod_line_edit,
mod_substitute) are applied.


Consider this test case. I wish for one substitution to be applied
when the content-type contains text, and the other to be applied when
the Content-Type does *not* contain text. In short, both filters are
exclusive. However, when a filter-name is called, all directives of
the corresponding provider are applied. So in the following examples,
both substitutions will always be used:


...

FilterProvider test substitute resp=Content-Type $text
Substitute s/a/QQQ/ni

FilterProvider test1 substitute resp=Content-Type !$text
Substitute s/s/ZZZZ/ni

FilterChain =test +test1



I am looking for a way to associate the configuration of a filter
provider with a named filter (alt. terminology: a registered filter, a
harness). For example, can I alias multiple [Substitute] lines as
separate filters? Perhaps something along the lines of:


...

FilterAlias sub1 Substitute s/foo/bar/ni
FilterProvider sub1 substitute resp=Content-Type $javascript
FilterChain +sub1

FilterAlias sub2 Substitute s/a/QQQ/ni
FilterProvider sub2 substitute resp=Content-Type $css
FilterChain +sub2

[more filter providers here]


On a final note, the documentation at
[http://httpd.apache.org/docs/trunk/mod/mod_filter.html] could use a
lot of clarification.

thank you,

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