core (xml_tools): added a method to find all elements corresponding to criteria

src/tools/xml_tools.py

@@ -1395,3 +1395,20 @@ def getText(node):
         if child.nodeType == child.TEXT_NODE:
             data.append(child.wholeText)
     return u"".join(data)
+
+def findAll(elt, names=None, namespaces=None):
+    """Find child element at any depth matching criteria
+
+    @param elt(domish.Element): top parent of the elements to find
+    @param names(iterable, None): names to match
+        None to accept every names
+    @param namespace(unicode): URIs to match
+        None to accept every namespaces
+    """
+
+    for child in elt.elements():
+        if ((not names or child.name in names) and
+            (not namespaces or child.uri in namespaces)):
+            yield child
+        for found in findAll(child, names):
+            yield found