[xsl] XSLT 4: Define proper streaming

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

This one should be obvious enough:

In XSLT 3.0 only a source XML document can be streaming -processed.

Why not an output of a (potentially other/unknown/external/independent)
transformation?

Why not an intermediate (working) tree?

Please, don't tell us that we don't know how to exactly formulate this
requirement, or that it is ("extremely") difficult to implement it. Both a
possible design and implementation are delivered in the concept of a
**concurrent queue**.

Another, but still similar approach is to use the concept and related
design pattern of  **observable**, and this also comes equipped with its
publish/subscribe mechanism, thus even lazy streams can be thought of.

Just my 2c.  :)
-- 
Cheers,
Dimitre Novatchev
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