3. Future directions
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## 3. Future directions

Some other filters that do not yet exist, but which would be useful, are briefly described. These may be added in future releases (or may be created by third parties, as loadable modules).

`frontend_cli` (source)

  Command-line interface for generating requests.

`sru_client` (sink)

  SRU/GET and SRU/SOAP searching and retrieval.

`opensearch_client` (sink)

  A9 OpenSearch searching and retrieval.

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