parameter-entity references

[Marko Milicevic <MMilicevic@pssd.com>]

I can not find the section of the standard that specifies whether the
following cases of parameter-entity references are valid or invalid?  Each
case occurs within the external DTD subset.

Thanks.

Marko.
.


1)
<!ENTITY % dog '% cat "c'>
<!ENTITY %dog; at">

2)
<!ELEMENT % dog "cat (AAA* ,">
<!ELEMENT %dog; BBB)>

3)
<!ELEMENT % dog "#PCDATA)">
<!ELEMENT cat (%dog;>