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We allow mode="#unnamed" on xsl:template and xsl:apply-templates, equivalent to omitting the mode attribute, but we don't allow name="#unnamed" on xsl:mode. Should we?
If we allow name="#unnamed" on xsl:mode then there's no good reason to disallow it on xsl:output and xsl:decimal-format and perhaps even xsl:template. And then you start wanting xsl:result-document format="#unnamed". Perhaps it's best not to go here.
The WG looked at this and decided to make no changes.