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In the XSLT 3.0 spec at, https://www.w3.org/TR/xslt-30/ I can see a typo that perhaps needs to be corrected. In the section, "15.3 Selecting the Sequences to be Merged" one of the lines of text says, "[ERR XTSE3195] If the for-each-item is present then the for-each-source, use-accumulators, and streamable attributes must both be absent." The phrase "must both" seems wrong. There are actually three options. Therefore, the corrected text can be, "[ERR XTSE3195] If the for-each-item is present then following three attributes for-each-source, use-accumulators, and streamable must be absent." OR "[ERR XTSE3195] If the for-each-item is present then the attributes for-each-source, use-accumulators, and streamable must be absent."
The draft erratum E40 picks up this typo, together with other more substantial problems in the same paragraph.