Language : ERD Notation: A formal Language to specify Data Models

Layer : WissDB - A possible (internal) Database Layer API
Layer : WissDB Data Layer Services

Locator_A : S_ Ensure_Association
Locator_A : S_ Forget_Association

Locator_B : S_ Ensure_Association
Locator_B : S_ Forget_Association

Locator_Restrictions : B_ Locator_Restrictions

Locators : V_ Locators

Locator : R_ Project Locator Presentation

Logical : WissDB: The Logical Data Model