IsPluginReferenceOrIdentity returns true if the argument matches a plugin reference (with version) or a plugin identity (without version).

NewPluginIdentity returns a new PluginIdentity.

NewPluginReference returns a new PluginReference.

PluginIdentityForString returns a new PluginIdentity for the given string.

PluginReferenceForString returns a new PluginReference for the given string.

PluginIdentity is a plugin identity.

PluginReference uniquely references a plugin (including version and revision information).