Componentdef Task

## componentdef

### Description

Adds a component definition to the current project. A component definition is the same as a typedef except:

1. that it can only be used in other types or tasks that accept components (by having an `add()` method).
2. multiple components may have the same name, provided they implement different interfaces.

The purpose of this is to allow internal Apache Ant definitions to be made for tags like `and` or `or`.

### Examples

Define two components with the same name `or`; one is a condition (see conditions) and one is a selector (see selectors).

    <componentdef name="or" onerror="ignore"
                  classname="com.apache.tools.ant.taskdefs.conditions.Or"/>
    <componentdef name="or" onerror="ignore"
                  classname="com.apache.tools.ant.types.resources.selectors.Or"/>