1 .. -*- coding: utf-8 -*-

     2 

     3 Data Model definition (*schema*)

     4 ================================

     5 

     6 The schema is the main concept of `LAX` applications as it defines the

     7 data model we will handle. It is based on entities types already defined

     8 in the library and others, more specific, we would expect to find in one or

     9 more Python files under the `schema` directory.

    10 

    11 It is important to make clear the difference between relation type and relation

    12 definition: a relation type is only a relation name with potentially other

    13 additionnal properties (see XXXX), whereas a relation definition is a complete

    14 triplet "<subject entity type> <relation type> <object entity type>". A relation

    15 type could have been implied if none is related to a relation definition of the

    16 schema.

    17 

    18 

    19 .. include:: 03-sect-stdlib-schemas.en.txt

    20 .. include:: 03-sect-definition-schema.en.txt