Column_name,Column_Datatype,Column_Length,Column_Description
Sitecode,nvarchar,24,An identifier for each site that is usually assigned by an organisation external to the archaeological contractor
CtxtNo,int,4,Context numbers referring to any type of archaeological class: contexts assigned by site are unique in sequence
Type,nvarchar,30,The archaeological class to which the context number applies.
Relationship,nvarchar,20,Describes the relationship between CtxtNo field value and the RelatedCtxt field value. The relationship should be read:  CtxtNo is above RelatedCtxt
RelatedCtxt,int,4,Context numbers referring to any type of archaeological class: contexts assigned by site are unique in sequence
RelatedType,nvarchar,30,The archaeological class to which the RelatedCtxt field value applies.
RelatedSite,nvarchar,24,The identifier for the site containing the related context