# Uses of Package
org.apache.olingo.server.api.etag

- Packages that use org.apache.olingo.server.api.etag
  Package | Description
  --- | ---
  org.apache.olingo.netty.server.core |
  org.apache.olingo.server.api | Olingo Server API The OData Library is a protocol implementation of the OData V4.0 standard.
  org.apache.olingo.server.api.etag | Olingo Server API - ETag The etag package is used to condense all about the Olingo ETag handling.

- Classes in org.apache.olingo.server.api.etag used by org.apache.olingo.netty.server.core
  Class and Description
  ETagHelper Used for ETag-related tasks.
  ServiceMetadataETagSupport Register implementations for this interface in oder to support etags for the metadata document and service document.

- Classes in org.apache.olingo.server.api.etag used by org.apache.olingo.server.api
  Class and Description
  CustomETagSupport Processors that would like to support etags for certain entity sets can implement this interface.
  ETagHelper Used for ETag-related tasks.
  ServiceMetadataETagSupport Register implementations for this interface in oder to support etags for the metadata document and service document.

- Classes in org.apache.olingo.server.api.etag used by org.apache.olingo.server.api.etag
  Class and Description
  PreconditionException This exception is thrown for invalid precondition error cases.
  PreconditionException.MessageKeys

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