A few filtering difficulties and suggestinogs

Here are some problems I ran into when using Genshi and
stream
transformation, with some possible remedies:

* Marked streams use a different protocol from all other
streams,
  making filter composition more difficult than necessary. 
IMO
  There's no reason you shouldn't be able to use an ordinary
filter on
  a marked stream.  You could instead piggyback the mark on
the event
  type much the same way you piggyback a namespace
qualification on
  QName objects.

* I wanted to select parts of a stream using xpath and apply
an
  ordinary transform to just the selected parts, but found
there was
  no easy way to do it.  Transformer('//some/xpath').apply(
x ) ought
  to be that way, but unfortunately that method name is
taken for a
  different purpose.  I suggest you add something that does
it.

* I know genshi itself is HTML-agnostic, but I really wanted
a way to
  select an element with a given class.  Since the class
attribute can
  often contain several space-separated class names, I
didn't see a
  reliable way to do it.  You could support the XPATH
"matches()"
  function.

Thanks for listening,

-- 
Dave Abrahams
Boost Consulting
http://www.boost-cons
ulting.com

The Astoria Seminar ==> http://www.astoriasemin
ar.com

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