code: public static RElement<RElement<?>> evalPredicate(Concatenator P) {
  		RElement<RElement<?>> ret = RFactory.resultOf(P);
  		ASTNode an = APIObjectAccess.getAstNode(ret);
  		an.setClauseType(ClauseType.WITH);
  		return ret;
  	}
docs: <div color='red' style="font-size:24px;color:red"><b><i><u>JCYPHER</u></i></b></div>
  <div color='red' style="font-size:18px;color:red"><i>return the result of evaluating a Predicate Expression (<b>true</b> or <b>false</b>)</i></div>
  <div color='red' style="font-size:18px;color:red"><i>Use Factory Class <b>P</b> to create a Predicate Expressions</i></div>
  <div color='red' style="font-size:18px;color:red"><i>e.g. <b>WITH.evalPredicate(P.valueOf(a.property("age")).GT(30))</b></i></div>
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