Question

Please allow to use the hide command to hide packages.

Example:

@startuml
package util {
class util1
}

hide util
@enduml

Answer 1

With last beta: https://dl.dropboxusercontent.com/u/13064071/plantuml.jar you can use the hide command to hide packages.

Example:

@startuml
class Foo1
class Foo2
hide Foo1
class Foo3
Foo2 *-- Foo3
hide Foo3

package util {
class util1
}

hide util
@enduml

Is this what you are expecting ?

Comments

Note that this has been released in V8045