## PropertySet

Since Ant 1.6

Groups a set of properties to be used by reference in a task that supports this.

Attribute | Description | Required
dynamic | Whether to reevaluate the set everytime the set is used. Default is "`true`". | No

### Parameters specified as nested elements

#### propertyref

Selects properties from the current project to be included in the set.

Attribute | Description | Required
name | Select the property with the given name. | Exactly one of these.
prefix | Select the properties whose name starts with the given string.
regexp | Select the properties that match the given regular expression. Similar to regexp type mappers, this requires a supported regular expression library.
builtin | Selects a builtin set of properties. Valid values for this attribute are `all` for all Ant properties, `system` for the system properties and `commandline` for all properties specified on the command line when invoking Ant (plus a number of special internal Ant properties).

#### propertyset

A `propertyset` can be used as the set union of more `propertyset`s.

For example:

>     <propertyset id="properties-starting-with-foo">
>       <propertyref prefix="foo"/>
>     </propertyset>
>     <propertyset id="properties-starting-with-bar">
>       <propertyref prefix="bar"/>
>     </propertyset>
>     <propertyset id="my-set">
>       <propertyset refid="properties-starting-with-foo"/>
>       <propertyset refid="properties-starting-with-bar"/>
>     </propertyset>

collects all properties whose name starts with either "foo" or "bar" in the set named "my-set".

#### mapper

A mapper - at maximum one mapper can be specified. The mapper is used to change the names of the property keys, for example:

>     <propertyset id="properties-starting-with-foo">
>       <propertyref prefix="foo"/>
>       <mapper type="glob" from="foo*" to="bar*"/>
>     </propertyset>

collects all properties whose name starts with "foo", but changes the names to start with "bar" instead.

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