Function xmlCreateIntSubset 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlCreateIntSubset(
    doc: *mut _xmlDoc,
    name: *const xmlChar,
    ExternalID: *const xmlChar,
    SystemID: *const xmlChar,
) -> *mut _xmlDtd

Create an internal subset (DTD).

UPSTREAM-PARITY

xmlDtdPtr xmlCreateIntSubset(xmlDocPtr doc, const xmlChar *name,
                             const xmlChar *ExternalID, const xmlChar *SystemID);