code: public static Concatenator has(IHas val) {
  		Concatenator ret = P.has(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>tests for existence of node labels or node/relation properties,</i></div>
  <div color='red' style="font-size:18px;color:red"><i>accepts expressions like '<b>n.property("age")</b>',</i></div>
  <div color='red' style="font-size:18px;color:red"><i>or '<b>n.label("Swedish")</b>'</i></div>
  <div color='red' style="font-size:18px;color:red"><i>e.g. WHERE.<b>has(n.property("age"))</b></i></div>
  <br/>