oxml: improve CT_Tc._tc XPath expression

Steve Canny · Steve Canny · commit 27c3888c6464 · 2016-04-09T18:51:12.000-07:00
Under certain circumstances, the w:tbl parent of a w:tc element is not
returned first in the result sequence. Add a position qualifier such
that only the first ancestor is returned and the return sequence only
contains that single value.
diff --git a/docx/oxml/table.py b/docx/oxml/table.py
@@ -651,7 +651,7 @@ def _tbl(self):
         """
         The tbl element this tc element appears in.
         """
-        return self.xpath('./ancestor::w:tbl')[0]
+        return self.xpath('./ancestor::w:tbl[position()=1]')[0]
 
     @property
     def _tc_above(self):
@@ -675,7 +675,7 @@ def _tr(self):
         """
         The tr element this tc element appears in.
         """
-        return self.xpath('./ancestor::w:tr')[0]
+        return self.xpath('./ancestor::w:tr[position()=1]')[0]
 
     @property
     def _tr_above(self):
