applied patch from Tomonori Nagano to fix pos tag issue, resolves issue 347

nltk/corpus/reader/childes.py

@@ -308,6 +308,18 @@ class CHILDESCorpusReader(XMLCorpusReader):
                         except AttributeError:
                             suffixStem = ""
                     # pos
+                     if relation or pos:
+                         try:
+                             xmlpos = xmlword.findall(".//{%s}c" % NS)
+                             xmlpos2 = xmlword.findall(".//{%s}s" % NS)
+                             if xmlpos2 != []:
+                                 tag = xmlpos[0].text+":"+xmlpos2[0].text
+                             else:
+                                 tag = xmlpos[0].text
+                                 word = (word,tag)
+                             if len(xmlpos) != 1 and suffixStem:
+                                 suffixStem = (suffixStem,xmlpos[1].text)
+                         except (AttributeError,IndexError) as e:
                     if relation or pos:
                         try:
                             xmlpos = xmlword.findall(".//{%s}c" % NS)