| SAXONICA | 
The saxon:call-template instruction is identical to xsl:call-template
            except that the template name can be written as an attribute value template, allowing the actual
            template that is called to be selected at run time.
         
Typical usage is:
            <saxon:call-template name="{$tname}"/>
This feature replaces the saxon:allow-avt attribute that was provided
               on xsl:call-template in earlier releases. The XSLT 2.0 rules on extension attributes
               have been tightened up, making it clear that the earlier design was non-conformant.
The saxon:call-template instruction allows xsl:fallback as a child
            element, so that fallback behaviour can be defined for other XSLT processors when they 
            encounter this instruction.