ME (case unimportant) is a special “built-in” data source that refers to the current in-memory database you are building.
ME is not declared at the top of the import file since it always refers to “this current import process”.
ME is used with the IMPORT statement when you want to refer to a table or execute a SQL command against a table that you have already imported in this same .imp file import.
DATASOURCE Source1 = ODBC 'odbc_connection_X'
/* Comments can be entered in an impfile like this */
DATASOURCE Source2 = ODBC 'odbc_connection_Y'
/* Comments can also begin and end with these characters which can be useful if they span more than one line */
DATASOURCE Source3 = SQLSERVER 'Provider=SQLNCLI11;
DATASOURCE yesterdays_targitdb = LOCAL IN-MEMORYDB 'contoso.targitdb'
DATASOURCE A1 = ODBC ‘odbc_connection_Z’