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The header is followed by a sequence of entity records. Each entity record consists of a sequence number (optional), an entity type identifier, the entity data, and a terminator.
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Pointers between entities are saved as
integer index values, with
NULL pointers represented by the value -1.
ACIS pointer indices are preceded by
$ in the SAT file, or by a binary Tag 12 in the SAB file.
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Top level entities (e.g., body entities) are always the first records in the save file. The rest of the data records are in no particular order.
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Beginning with
ACIS Release 7.0, the format of
ENTITY and
HISTORY_STREAM records has been changed to accommodate the addition of entity IDs. A new integer field has been added to the entity record to hold the entity's ID. A value of -1 indicates that an ID has not yet been requested for the
ENTITY. This is field #2 in any entity record, where the entity type is field #0. A new integer field has been added to history stream records (part of the history data section) to hold the next available entity ID in that stream. This is field #3 in the history stream record, where "history_stream" is the first field.
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