Fixed the definition of the default XML namespace when using

   lxml 4.4. Patch by Isaac Muse. [bug=1840141]

2 files changed, 8 insertions, 0 deletions

diff --git a/CHANGELOG b/CHANGELOG
index cff70be..c992747 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -6,6 +6,9 @@
   and position within a line (Tag.sourcepos).  Based on code by Chris
   Mayo. [bug=1742921]
 
+* Fixed the definition of the default XML namespace when using
+   lxml 4.4. Patch by Isaac Muse. [bug=1840141]
+
 * Fixed a crash when pretty-printing tags that were not created
    during initial parsing. [bug=1838903]
 
diff --git a/bs4/element.py b/bs4/element.py
index 24d504b..d6ed020 100644
--- a/bs4/element.py
+++ b/bs4/element.py
@@ -46,6 +46,11 @@ def _alias(attr):
 class NamespacedAttribute(unicode):
 
     def __new__(cls, prefix, name, namespace=None):
+        if not name:
+            # This is the default namespace. Its name "has no value"
+            # per https://www.w3.org/TR/xml-names/#defaulting
+            name = None
+
         if name is None:
             obj = unicode.__new__(cls, prefix)
         elif prefix is None: