Simplify handling of parameter entity references There are only two places where parameter entity references must be handled. For the internal subset in xmlParseInternalSubset. For the external subset or content from other external PEs in xmlSkipBlankChars. Make sure that xmlSkipBlankChars skips over sequences of PEs and whitespace. Rely on xmlSkipBlankChars instead of calling xmlParsePEReference directly when in the external subset or a conditional section. xmlParserHandlePEReference is unused now.