+ /**
+ * Get current line in yang file.
+ *
+ * @return current line in yang file
+ */
+ int getLine();
+
+ /**
+ * Get parent node of this node.
+ *
+ * @return parent node builder or null if this is top level node
+ */
+ Builder getParent();
+
+ /**
+ * Set parent of this node.
+ *
+ * @param parent
+ * parent node builder
+ */
+ void setParent(Builder parent);
+