Each theme in a data group starts with a Data Theme Header Record (DTHR). This record defines the entity type (point, line, area) contained in the theme, the number of attributes defined on each entity in the theme, and the length of the fixed length entity records within the theme.
All entities within a particular theme must be of the same entity type and must have the same set of attributes.
FME represents a DTHR with a CCOGIF_METADATA feature with the following attributes:
|
Attribute Name |
Description |
Type |
|
ccogif_record_code |
Record code, constant DTHR. |
char(4) |
|
ccogif_entity_type |
Type of entity in theme (POINT, LINE, AREA). |
char(8) |
|
ccogif_num_entities |
Number of entities in this data theme. |
int(16) |
|
ccogif_num_attr_desc |
Number of attributes defined on each entity of the theme. |
int(16) |
|
ccogif_fixed_len_bytes |
Length of the fixed length portion of each entity in the theme. |
int(16) |