The term schema class in this user guide refers to a table heading from an Excel or CSV file that has been imported using the Excel Import plugin. The fileSchema stereotype is applied to this schema class.
A class mapping contains mapped properties of a schema class and a target element. The classMapping stereotype is applied to this class mapping.
A mapping diagram is a Composite Structure diagram that illustrates a mapping of properties of a schema class to the properties of a target element and it uses connectors to indicate mapping relationships.
The table with composite headers means a table with two or more merged columns under one headers. A merged column will be imported as a schema class and the columns under it will be imported as attributes of the schema class.