| PullPushTee is a pass-through filter class that links one PullProvider to another PullProvider
in a pipeline, copying all events that are read into a push pipeline, supplied in the form
of a Receiver.
This class can be used to insert a schema validator into a pull pipeline, since Saxon's schema
validation is push-based. It could also be used to insert a serializer into the pipeline, allowing
the XML document being "pulled" to be displayed for diagnostic purposes.
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