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 of data containing attributive 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.
Import of table data from MID file is impossible without MIF file with the 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.
MIF file also contains descriptions of features, every string of MID file corresponds to one feature. If all table records or some of them are not linked with any feature, a special dummy feature “None” is used in MIF file. If import of table data from MID file is performed, features of MIF file do not participate in the operation.
Correspondence between field types of data of MID format and field types of ObjectLand tables is given in chapter 64 “Import of spatial data in MIF format”, table 64-1.
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