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  2. GEDCOM - Wikipedia

    en.wikipedia.org/wiki/GEDCOM

    Website. gedcom .io. github .com /familysearch /GEDCOM. GEDCOM ( / ˈdʒɛdkɒm / JED-kom ), complete name FamilySearch GEDCOM, is a de facto open file format specification to store genealogical data, and import or export it between compatible genealogy software. [2] GEDCOM is an acronym standing for Genealogical Data Communication.

  3. User-defined function - Wikipedia

    en.wikipedia.org/wiki/User-defined_function

    In relational database management systems, a user-defined function provides a mechanism for extending the functionality of the database server by adding a function, that can be evaluated in standard query language (usually SQL) statements. The SQL standard distinguishes between scalar and table functions. A scalar function returns only a single ...

  4. Database storage structures - Wikipedia

    en.wikipedia.org/wiki/Database_storage_structures

    Database storage structures. Database tables and indexes may be stored on disk in one of a number of forms, including ordered/unordered flat files, ISAM, heap files, hash buckets, or B+ trees. Each form has its own particular advantages and disadvantages. The most commonly used forms are B-trees and ISAM. Such forms or structures are one aspect ...

  5. Relational model - Wikipedia

    en.wikipedia.org/wiki/Relational_model

    The relational model ( RM) is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by English computer scientist Edgar F. Codd, [1] [2] where all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a ...

  6. Decentralized identifier - Wikipedia

    en.wikipedia.org/wiki/Decentralized_identifier

    The name of the DID method (which must appear between the first and second colon, e.g., did:example:). The structure of the unique identifier that must follow the second colon. The technical specifications for how a DID resolver can apply the CRUD operations to create, read, update, and deactivate a DID document using that method.

  7. Data - Wikipedia

    en.wikipedia.org/wiki/Data

    t. e. In common usage, data ( / ˈdeɪtə /, also US: / ˈdætə /; ) is a collection of discrete or continuous values that convey information, describing the quantity, quality, fact, statistics, other basic units of meaning, or simply sequences of symbols that may be further interpreted formally. A datum is an individual value in a collection ...

  8. Domain Name System - Wikipedia

    en.wikipedia.org/wiki/Domain_Name_System

    The Domain Name System ( DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources in the Internet or other Internet Protocol (IP) networks. It associates various information with domain names (identification strings) assigned to each of the associated entities.

  9. Digital object identifier - Wikipedia

    en.wikipedia.org/wiki/Digital_object_identifier

    Resolution redirects the user from a DOI name to one or more pieces of typed data: URLs representing instances of the object, services such as e-mail, or one or more items of metadata. To the Handle System, a DOI name is a handle, and so has a set of values assigned to it and may be thought of as a record that consists of a group of fields.