I have an XSD (for HTML 4.01, from the usual public source) which includes parameter-entity declarations such as the following:
<!ENTITY % ContentType "CDATA" >
... but when I reference this DTD using PHP-7's DOMDocument::schemaValidate function, I seem to get the following error:
StartTag: invalid element name
... followed by the declaration shown above.
This is then followed by the following message, again followed by the declaration:
Extra content at the end of the document
Does PHP-7's implementation of DTD schema validation really not support parameter-entity syntax?
Also note: My objective is to use this to validate an HTML document, not an XML document. Any comments on this are also requested.