in src/main/java/org/apache/maven/xinclude/stax/XPointerParser.java [610:620]
protected static void addToken(Tokens tokens, int token) {
if (token == Tokens.XPTRTOKEN_OPEN_PAREN
|| token == Tokens.XPTRTOKEN_CLOSE_PAREN
|| token == Tokens.XPTRTOKEN_SCHEMENAME
|| token == Tokens.XPTRTOKEN_SCHEMEDATA
|| token == Tokens.XPTRTOKEN_SHORTHAND) {
tokens.addToken(token);
return;
}
throw new IllegalArgumentException("InvalidXPointerToken");
}