Currently we have:

[ERR XTSE0120] An xsl:stylesheet element must not have any text node children.

and:

[ERR XTSE0130] It is a static error if the xsl:stylesheet element has a child element whose name has a null namespace URI.


I propose to update these errors:

[ERR XTSE0120] An xsl:stylesheet, xsl:transform or xsl:package element must not have any text node children.

and:

[ERR XTSE0130] It is a static error if an xsl:stylesheet, xsl:transform or xsl:package element has a child element whose name has a null namespace URI.

We could consider adding to XTSE0130/XTSE0120 other instructions/declarations that have a defined body, i.e. that do not allow a sequence constructor (like xsl:fork, xsl:choose etc). In fact, we could generalize it perhaps.