code: public RElement<RElement<?>> existsPattern(IElement X) {
  		ReturnExpression rx = getReturnExpression();
  		ReturnPattern pat = new ReturnPattern();
  		pat.setPatternExpression(
  				XFactory.getExpression(X));
  		rx.setReturnValue(pat);
  		RElement<RElement<?>> ret = new RElement<RElement<?>>(rx);
  		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>try to match a pattern against the graph. If a match is found return <b>true</b> else return <b>false</b></i></div>
  <div color='red' style="font-size:18px;color:red"><i>Use Factory Class <b>X</b> to create a Pattern Expressions</i></div>
  <div color='red' style="font-size:18px;color:red"><i>e.g. <b>existsPattern(X.node(n)...)</b></i></div>
  <br/>