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docs: improve communication picture and section
Indicate that only messages go via bus. Also add queries between elements.
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@ -131,7 +131,9 @@
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<listitem>
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<para>
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<emphasis>queries</emphasis>: allow application to request information
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from the pipeline. Queries are answered synchronously.
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from the pipeline. Queries are answered synchronously. Also elements
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can use queries. They can be used both ways, but most common are
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downstream queries.
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</para>
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</listitem>
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</itemizedlist>
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