code: public static BooleanOperation valueOf(ValueElement val) {
  		BooleanOperation ret = P.valueOf(val);
  		ASTNode an = APIObjectAccess.getAstNode(ret);
  		an.setClauseType(ClauseType.WHERE);
  		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>takes an expression like '<b>n.property("age")</b>', yielding a property,</i></div>
  <div color='red' style="font-size:18px;color:red"><i>or '<b>x.length()</b>', calculating some value</i></div>
  <div color='red' style="font-size:18px;color:red"><i>e.g. WHERE.<b>valueOf(n.property("age"))</b>...</i></div>
  <br/>