> 2. xslt top-level-elements (13 in total), element-available() 
> returns 11x false [1]
>     * xsl:decimal-format - true
>     * xsl:param - true
> 

Although the function is called element-available(), the specification says
that it returns true only for *instructions* that are available.
Implementations are known to differ in the results they return for
non-instruction elements such as xsl:decimal-format, xsl:param and
xsl:template.

Michael Kay
http://www.saxonica.com/