GEDCOM

GEDCOM (an acronym standing for Genealogical Data Communication) is a proprietary and open de factospecification for exchanging genealogical data between different genealogy software. GEDCOM was developed by The Church of Jesus Christ of Latter-day Saints (LDS Church) as an aid to genealogical research.

A GEDCOM file is plain text (usually either ANSEL or ASCII) containing genealogical information about individuals, and meta data linking these records together. Most genealogy software supports importing from and/or exporting to GEDCOM format. However, some genealogy software programs incorporate the use of proprietary extensions to the GEDCOM format, which are not always recognized by other genealogy programs, for example the GEDCOM 5.5 EL (Extended Locations) specification.

While GEDCOM X and several other files have been suggested as replacements, the current 1996 version remains the industry standard 20 years on.

GEDCOM model

GEDCOM uses a lineage-linked data model. This data model is based on the nuclear family and the individual. This contrasts with evidence-based models, where data is structured to reflect the supporting evidence. In the GEDCOM lineage-linked data model, all data is structured to reflect the believed reality, that is, actual (or hypothesized) nuclear families and individuals.