Add method InstanceNode::xpath_parent.

setup.py

@@ -10,7 +10,7 @@ def contents(*filenames):
 setup(
     name = "yangson",
     packages = ["yangson"],
-    version = "0.1.49",
+    version = "0.1.50",
     description = "Library for working with YANG schemas and data",
     author = "Ladislav Lhotka",
     author_email = "lhotka@nic.cz",

yangson/instance.py

@@ -278,6 +278,9 @@ class InstanceNode:
         """Return the node-set of receiver's XPath following-siblings."""
         return []
 
+    def xpath_parent(self) -> List["InstanceNode"]:
+        return [self.up()]
+
     def deref(self) -> List["InstanceNode"]:
         """Return the list of nodes that the receiver refers to.
 
@@ -522,6 +525,9 @@ class ArrayEntry(InstanceNode):
         return ([] if qname and self.qualName != qname
                 else self.following_entries())
 
+    def xpath_parent(self) -> List["InstanceNode"]:
+        return [self.up().up()]
+
 class InstancePath(list):
     """Instance route."""
 

yangson/xpathast.py

@@ -309,7 +309,7 @@ class Step(Expr):
                 lambda n, qn=self.qname: n.following_siblings(qn),
             Axis.parent: (
                 lambda n, qn=self.qname: [] if qn and qn != n.parent.qualName
-                else [n.up()]),
+                else n.xpath_parent()),
             Axis.preceding_sibling:
                 lambda n, qn=self.qname: n.preceding_siblings(qn),
             Axis.self: