This is a question about the XSLT 3 development branch of Xalan; the documentation https://xalan.apache.org/xalan-j/xsl3/xalanj_xslt3.0_implementation_status.pdf mentions as XPath 3.1 features "2.9 Sequence constructor expression, using comma operator". Should it be possible to use that in XSLT select expressions of e.g. xsl:value-of or xsl:apply-templates? For me a simple attempt like <xsl:value-of select="10,20"/> gives an error like "Extra illegal tokens: ',', '20'; Line#: 16; Column#: 35". In what way is the comma operator supported?
