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## org.apache.tapestry5.ioc.def
Interface ContributionDef3

All Superinterfaces:
  ContributionDef, ContributionDef2, Markable

All Known Implementing Classes:
  ContributionDefImpl

    public interface ContributionDef3

extends ContributionDef2

Starting in Tapestry 5.3, contributions could be optional.

Since:
  5.3

Method Summary
`boolean` | `isOptional()`

Methods inherited from interface org.apache.tapestry5.ioc.def.ContributionDef
`contribute, contribute, contribute, getServiceId`

Methods inherited from interface org.apache.tapestry5.ioc.Markable
`getMarkers, getServiceInterface`

Method Detail

### isOptional

    boolean isOptional()

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