code: public boolean isMeta() {
  		if (parent != null) {
  			if (value != null && value == parent.meta) {
  				return true;
  			}
  			return parent.isMeta();
  		}
  		return false;
  	}
docs: Returns {@code true}, if this node is the part of the metadata structure.
  Sample: <br>
  <br>
  Tree node = new Tree();<br>
  node.put("_meta.property", true);<br>
  or<br>
  node.getMeta().put("property", true);<br>
  <br>
  The node.get("_meta.property").isMeta() returns {@code true}.
  
  @return {@code true}, if the document's metadata structure contains this
  node