Name in the document type declaration.
OptionalpublicPublic identifier in the document type declaration, if present.
All whitespace in the public identifier is normalized to single space characters, and leading and trailing whitespace is removed.
OptionalsystemSystem identifier in the document type declaration, if present.
It is meant to be converted to a URI reference relative to the document entity, the parser does not process it as external markup declarations are not supported.
System identifiers may contain characters that, according to IETF RFC 3986, must be escaped before a URI can be used to retrieve the referenced resource.
Document type declaration.