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Under section 2.10 Streaming (http://www.w3.org/TR/xslt-30/#streaming-concepts), the tenth paragraph (starting with "Streamed processing of a document can be initiated in one of two ways"). This should be one of three ways, as xsl:merge can also initiate streaming.
The WG discussed this during the ftf meeting in Prague and agreed with the suggestion (noting that strictly speaking it's xsl:merge-source that initiates streaming on an individual source of data).
Change applied.