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In the section "18.2.2 Applicability of Accumulators" of XSLT 3.0 spec, somewhere near the bottom of this section, its mentioned "The value of the use-accumulators attribute of xsl:source-document, xsl:merge-source, or xsl:mode must either a whitespace-separated list of EQNames, or the special token #all". I think above quoted phrase should be following, "The value of the use-accumulators attribute of xsl:source-document, xsl:merge-source, or xsl:mode must either *be* a whitespace-separated list of EQNames, or the special token #all". i.e an additional word "be" as suggested would be ok I think.