docs: improve communication picture and section

Indicate that only messages go via bus. Also add queries between elements.
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Stefan Kost 2010-03-31 11:26:28 +03:00
parent 133792e5cd
commit 92fb25f593
3 changed files with 13663 additions and 13566 deletions

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@ -131,7 +131,9 @@
<listitem>
<para>
<emphasis>queries</emphasis>: allow application to request information
from the pipeline. Queries are answered synchronously.
from the pipeline. Queries are answered synchronously. Also elements
can use queries. They can be used both ways, but most common are
downstream queries.
</para>
</listitem>
</itemizedlist>