Implementation Types

An ItemType can be defined with two different implementations - Single Item and Poly Item.

 

 

 

Single Item

The Single Item type is the most common implementation approach.  In Single Item, each ItemType represents an individual business object, and is represented in a relational database as a single table. Examples of a Single Item type include definitions of Part, Document, Project, DFMEA, etc.

Poly Item

A Poly Item implementation type represents a  polymorphic class of ItemType.  A Poly Item ItemType can represent a collection of other ItemTypes.  A polymorphic (Poly Item) ItemType is typically used when a  property of some other item can reference more than one possible type of Item - a project Deliverable, for example.  The type of deliverable can be one of many possible types if Item. The deliverable may be a Document, a Part, a Control plan, etc.

The Poly Item type has a somewhat limited set of compatible relationships that are applicable in the ItemType definition.  Only those Tabs that remain active in the ItemType form are supported in a Poly Item type.

 

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