[Bug 28525] [XSLT30] (editorial) Allowed/disallowed attributes of xsl:param

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28525

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
The inconsistency between "required" and "tunnel" exists already in the XSLT
2.0 specification. 

For xsl:param/@tunnel (end of 9.2) 2.0 says:

The optional tunnel attribute may be used to indicate that a parameter is a
tunnel parameter. The default is no; the value yes may be specified only for
template parameters.

For xsl:param/@required (earlier in the same section) 2.0 says:

The optional required attribute may be used to indicate that a parameter is
mandatory. This attribute may be specified for stylesheet parameters and for
template parameters; it must not be specified for function parameters, which
are always mandatory.

I'm disinclined to introduce a backwards incompatibility here just in the
interests of tidying this up. I'm more inclined to go the other way, by
allowing the values tunnel="no", required="yes", or static="no" in all cases
where the attribute is currently disallowed.

Having a table to present the options seems an excellent idea.

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