difference between xsl:param and xsl:variable

Question

i am considering either one to use when defining an xsl:template name = myTemplate that will be called in another xsl file.

legacy code seems to use \'xsl:variable\' whe

Answer 1

The difference is that the value of an xsl:param could be set outside the context in which it is declared. For example, see:

   
   
...

then you know that $v will always give you the string 'y'. But for $p the string 'x' is only a default: you will see a different value if the template is invoked with either xsl:apply-templates or xsl:call-template which contains an instruction such as:

may also be used outside xsl:template, at the top level in the stylesheet. The value of such a parameter may be set when the XSLT processor is called. How this is done depends on the processor and whether you call it from the command line or by program.