As it was mentioned in chapter 64 “Import of spatial data in MIF format”, subsection “Data files of MIF/MID format”, file of MIF format is a text file which contains graphic data (features) and also possibly description of a table containing data linked with features.
Table data itself is stored in the file with MID extension which name should coincide with the name of the corresponding MIF file. Every table record occupies one line of the file. Record fields are separated from one another by a separator character specified in MIF file.
Thus, performing export of table data to MID format doesn't assume only creation of MID file, but also creation of MIF file with same name in which the number of table fields, names, sizes and types of data for each field are indicated and also a separator character of fields is specified and lists of indexed and unique fields are stored. In accordance with MIF format requirements the corresponding file will also contain a list of empty features “None”, one feature for every record of MID file being exported.
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