Actual content model is non-deterministic, hence wildcard. The following shows intended content model:
<xs:element ref='wst14:Title' minOccurs='0' />
<xs:element ref='wst14:TextChallenge' minOccurs='0' />
<xs:element ref='wst14:ChoiceChallenge' minOccurs='0' />
<xs:element ref='wst14:ContextData' minOccurs='0' />
Actual content model is non-deterministic, hence wildcard. The following shows intended content model:
<xs:element ref='wst14:TextChallengeResponse' minOccurs='0' />
<xs:element ref='wst14:ChoiceChallengeResponse' minOccurs='0' />
<xs:element ref='wst14:ContextData' minOccurs='0' />