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@@ -115,7 +115,7 @@ class LoncapaModule(XModule):
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dom2 = etree.fromstring(xml)
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self.explanation=content_parser.item(dom2.xpath('/problem/@explain'))
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self.explanation=content_parser.item(dom2.xpath('/problem/@explain'), default="closed")
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self.explain_available=content_parser.item(dom2.xpath('/problem/@explain_available'))
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self.due_date=content_parser.item(dom2.xpath('/problem/@due'))
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