Allow root tag name to be tweaked.

Author: faulkner

docs/renderers.md

@@ -60,3 +60,5 @@ If you are considering using `XML` for your API, you may want to consider implem
 **.charset**: `utf-8`
 
 **item_tag_name**: `list-item`
+
+**.root_tag_name**: `root`

rest_framework_xml/renderers.py

@@ -19,6 +19,7 @@ class XMLRenderer(BaseRenderer):
     format = 'xml'
     charset = 'utf-8'
     item_tag_name = 'list-item'
+    root_tag_name = 'root'
 
     def render(self, data, accepted_media_type=None, renderer_context=None):
         """
@@ -31,11 +32,11 @@ def render(self, data, accepted_media_type=None, renderer_context=None):
 
         xml = SimplerXMLGenerator(stream, self.charset)
         xml.startDocument()
-        xml.startElement("root", {})
+        xml.startElement(self.root_tag_name, {})
 
         self._to_xml(xml, data)
 
-        xml.endElement("root")
+        xml.endElement(self.root_tag_name)
         xml.endDocument()
         return stream.getvalue()