POSITION

The POSITION sub-descriptor defines the token position of a data element. The first available position in a GAV data file is one. POSITION sub-descriptors are only used in GAV schema files of the VARIABLE category. This sub-descriptor is usually used in conjunction with the TYPE sub-descriptor.

Example:

    GAV Data File       GAV Schema File
    _____________       _______________

    70 62 31            GAV
    95 47 39            CATEGORY: VARIABLE
    82 58 32            SEPARATOR_CHARS: " "
    79 61 33            DATA: TYPE(X) POSITION(2)
    81 55 34            DATA: TYPE(Y) POSITION(3)
                        DATA: TYPE(Z) POSITION(1)

    Resulting Records (X, Y, Z)
    ___________________________

    (62, 31, 70)
    (47, 39, 95)
    (58, 32, 82)
    (61, 33, 79)
    (55, 34, 81)

In this example, the fields in one record of the data file represent elevation (z-position), x-position, and y-position, respectively. Thus, the schema file assigns the fields in positions two (2) and three (3) of each record to the special vector attribute types X and Y, and the field in position one (1) to Z.