extLst: A CT_ExtensionList ([ISO/IEC29500-4:2011] section A.2) element that specifies future extensibility for this element.
Attributes:
binding: An unsignedInt ([XMLSCHEMA2] section 3.3.22) attribute that specifies the unique identifier (UID) of the Table Column ([ISO/IEC29500-1:2011] section 18.5.1.3) to which the survey question is bound. MUST match the id of an existing Table Column ([ISO/IEC29500-1:2011] section 18.5) element within the Table ([ISO/IEC29500-1:2011] section 18.5) with which the survey is associated.
text: An ST_Xstring ([ISO/IEC29500-1:2011] section 22.9.2.19) attribute that specifies the main text of the survey question.
type: An ST_QuestionType attribute that specifies the type of the survey question.
format: An ST_QuestionFormat attribute that specifies the format of answers to the survey question.
