private void parseDataTypesDecl() {
    final PsiBuilder.Marker marker = begin();
    match(IDENTIFIER_OR_KEYWORD, RelaxngBundle.message("relaxng.parse.error.identifier-expected"));
    match(EQ, RelaxngBundle.message("relaxng.parse.error.equals-expected"));
    parseNsUriLiteral();
    marker.done(RncElementTypes.DATATYPES_DECL);
  }
private void parseDataTypesDecl()