--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/planemo/xml/diff.py	Thu May 14 14:56:58 2020 -0400
@@ -0,0 +1,59 @@
+
+def diff(x1, x2, reporter=None):
+    """Return 0 if and only if the XML has the same content."""
+    compare = xml_compare(x1, x2, reporter)
+    return_val = 0 if compare else 1
+    return return_val
+
+
+# From
+# bitbucket.org/ianb/formencode/src/tip/formencode/doctest_xml_compare.py
+# with (PSF license)
+def xml_compare(x1, x2, reporter=None):
+    if reporter is None:
+        def reporter(x):
+            return None
+
+    if x1.tag != x2.tag:
+        reporter('Tags do not match: %s and %s\n' % (x1.tag, x2.tag))
+        return False
+    for name, value in x1.attrib.items():
+        if x2.attrib.get(name) != value:
+            reporter('Attributes do not match: %s=%r, %s=%r\n'
+                     % (name, value, name, x2.attrib.get(name)))
+            return False
+    for name in x2.attrib.keys():
+        if name not in x1.attrib:
+            reporter('x2 has an attribute x1 is missing: %s\n'
+                     % name)
+            return False
+    if not text_compare(x1.text, x2.text):
+        reporter('text: %r != %r\n' % (x1.text, x2.text))
+        return False
+    if not text_compare(x1.tail, x2.tail):
+        reporter('tail: %r != %r\n' % (x1.tail, x2.tail))
+        return False
+    return _compare_children(x1, x2, reporter)
+
+
+def _compare_children(x1, x2, reporter):
+    cl1 = list(x1)
+    cl2 = list(x2)
+    if len(cl1) != len(cl2):
+        reporter('children length differs, %i != %i\n'
+                 % (len(cl1), len(cl2)))
+        return False
+    i = 0
+    for c1, c2 in zip(cl1, cl2):
+        i += 1
+        if not xml_compare(c1, c2, reporter=reporter):
+            reporter('children %i do not match: %s\n'
+                     % (i, c1.tag))
+            return False
+    return True
+
+
+def text_compare(t1, t2):
+    if not t1 and not t2:
+        return True
+    return (t1 or '').strip() == (t2 or '').strip()