diff --git a/CHANGES.md b/CHANGES.md
index 06776e81..9fd28a6e 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -41,6 +41,7 @@
 * Change check_url function to use requests instead of httplib library
 * Update Six compatibility library 1.5.2 to 1.9.0 (8a545f4)
 * Update SimpleJSON library 2.0.9 to 3.7.3 (0bcdf20)
+* Update xmltodict library 0.9.0 to 0.9.2 (579a005)
 
 [develop changelog]
 * Update Requests library 2.7.0 (ab1f493) to 2.7.0 (8b5e457)
diff --git a/lib/xmltodict.py b/lib/xmltodict.py
index 4fdbb16a..746a4bcd 100644
--- a/lib/xmltodict.py
+++ b/lib/xmltodict.py
@@ -29,7 +29,7 @@ except NameError:  # pragma no cover
     _unicode = str
 
 __author__ = 'Martin Blech'
-__version__ = '0.9.0'
+__version__ = '0.9.2'
 __license__ = 'MIT'
 
 
@@ -94,7 +94,7 @@ class _DictSAXHandler(object):
             self.stack.append((self.item, self.data))
             if self.xml_attribs:
                 attrs = self.dict_constructor(
-                    (self.attr_prefix+key, value)
+                    (self.attr_prefix+self._build_name(key), value)
                     for (key, value) in attrs.items())
             else:
                 attrs = None
@@ -256,17 +256,20 @@ def _emit(key, value, content_handler,
           preprocessor=None,
           pretty=False,
           newl='\n',
-          indent='\t'):
+          indent='\t',
+          full_document=True):
     if preprocessor is not None:
         result = preprocessor(key, value)
         if result is None:
             return
         key, value = result
-    if not isinstance(value, (list, tuple)):
+    if (not hasattr(value, '__iter__')
+            or isinstance(value, _basestring)
+            or isinstance(value, dict)):
         value = [value]
-    if depth == 0 and len(value) > 1:
-        raise ValueError('document with multiple roots')
-    for v in value:
+    for index, v in enumerate(value):
+        if full_document and depth == 0 and index > 0:
+            raise ValueError('document with multiple roots')
         if v is None:
             v = OrderedDict()
         elif not isinstance(v, dict):
@@ -318,7 +321,8 @@ def unparse(input_dict, output=None, encoding='utf-8', full_document=True,
     can be customized with the `newl` and `indent` parameters.
 
     """
-    ((key, value),) = input_dict.items()
+    if full_document and len(input_dict) != 1:
+        raise ValueError('Document must have exactly one root.')
     must_return = False
     if output is None:
         output = StringIO()
@@ -326,7 +330,9 @@ def unparse(input_dict, output=None, encoding='utf-8', full_document=True,
     content_handler = XMLGenerator(output, encoding)
     if full_document:
         content_handler.startDocument()
-    _emit(key, value, content_handler, **kwargs)
+    for key, value in input_dict.items():
+        _emit(key, value, content_handler, full_document=full_document,
+              **kwargs)
     if full_document:
         content_handler.endDocument()
     if must_return: