# Special Objects

## Special Objects Introduction

The previous discussion explained what a basic object is. The next section goes a step further and teaches how to create objects, how to use pre-made objects which are more detailed than just shapes, and much more!

## Special Object Categories

Special objects are broken into different categories. This way, someone creating a diagram of a circuit board can see only the objects which apply to them. Dia supports numerous pre-defined categories.

Circuit

  A group for people interested in creating diagrams of electrical circuits.

Ladder

  This one is beyond my knowledge

ER

  Editor for Entity Relations Diagrams

FS

  Editor for Function Structure Diagrams

Flowchart

  A group dedicated to providing the user shapes which are commonly used in flow charts. Flow charts can be routinely found in computer programming, marketing, economics, and any other semi-linear operation which requires planning.

GRAFCET

  A chart which diagrams the step, the action, the transition, and the condition associated to the transition.

SADT

  Good question!

UML

  Refer above

Chronogram

  Uses objects to be used in a chronographic design. These are common place in time lines.

Network

  Used by network administrators to create a design of their network.

Sybase

  Designs diagrams display the flow of a Sybase computer network.

Electric

  Shows flow of electricity, I guess

Pnumatic/Hydraulic

  Allows diagraming of a device which employes hydraulics.