Function xmlTextReaderIsValid 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlTextReaderIsValid(
    reader: *mut XmlTextReader,
) -> c_int

Return the validation status of the reader.

UPSTREAM-PARITY

Upstream xmlTextReaderIsValid returns 1 when the document validated successfully, 0 when no validation was performed, and -1 for a NULL reader. The candidate reader does not yet perform DTD/XSD/RNG validation (tracked in the parity ledger), so it reports 0 unless the parse was run with validation requested.

int xmlTextReaderIsValid(xmlTextReaderPtr reader);

Safety

reader must be a valid pointer or NULL.