p.location-badge.
exported from <a href='../di'>angular2/di</a>
defined in <a href="https://github.com/angular/angular/tree/2.0.0-alpha.34/modules/angular2/src/di/decorators.ts#L17-L25">angular2/src/di/decorators.ts (line 17)</a>
:markdown
Factory for creating <a href='OptionalMetadata-class.html'><code>OptionalMetadata</code></a>.
