Sequence operators and type errors

Sequence operators can be used only with sequences which contains only nodes. Any use of an item which is not a node results in fatal error.

XSLT

      <xsl:stylesheet
                  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                  version="2.0">
            <xsl:output  method="xml"
                        indent="yes"
                        omit-xml-declaration="yes"/>

            <xsl:template  match="/aaa">
                  <xxx>
                        <xsl:value-of  select="(1,2,3) union (1,2)"/>
                  </xxx>
                  <yyy>
                        <xsl:value-of  select="'Hello' intersect 'll'"/>
                  </yyy>
            </xsl:template>

      </xsl:stylesheet>

XML

<aaa/>

Output

Error:

error - XPTY0004
Required item type of first operand of '|' is node(); supplied value has item type xs:integer

error - XPTY0004
Required item type of first operand of 'intersect' is node(); supplied value has item type xs:string

Failed to compile stylesheet. 2 errors detected.

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