diff --git a/KissXML/DDXMLNode.h b/KissXML/DDXMLNode.h
index eafde87f..818f97d4 100644
--- a/KissXML/DDXMLNode.h
+++ b/KissXML/DDXMLNode.h
@@ -110,6 +110,8 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nullable, readonly, copy) DDXMLNode *nextNode;
 
 - (void)detach;
+- (BOOL)isDescendant:(DDXMLNode *)of;
+- (BOOL)isAncestor:(DDXMLNode *)of;
 
 @property (nullable, readonly, copy) NSString *XPath;
 
@@ -138,4 +140,4 @@ NS_ASSUME_NONNULL_BEGIN
 //- (NSArray *)objectsForXQuery:(NSString *)xquery error:(NSError **)error;
 
 @end
-NS_ASSUME_NONNULL_END
\ No newline at end of file
+NS_ASSUME_NONNULL_END
diff --git a/KissXML/DDXMLNode.m b/KissXML/DDXMLNode.m
index f9d5ffdb..dc52865e 100644
--- a/KissXML/DDXMLNode.m
+++ b/KissXML/DDXMLNode.m
@@ -842,6 +842,27 @@ - (DDXMLNode *)nextNode
 	return nil;
 }
 
+/**
+ * Returns if node is descendant of the other node.
+**/
+- (BOOL)isDescendant:(DDXMLNode *)of
+{
+    if (self.parent == nil)
+        return NO;
+    if (self.parent == of)
+        return YES;
+    else
+        return [self.parent isDescendant:of];
+}
+
+/**
+ * Returns if node is ancestor of the other node.
+**/
+- (BOOL)isAncestor:(DDXMLNode *)of
+{
+    return [of isDescendant:self];
+}
+
 /**
  * Detaches the receiver from its parent node.
  *