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# 7.25.7. `grn_content_type`

## 7.25.7.1. 概要

`grn_content_type` shows input type and output type. Currently, it is used only for output type.

Normally, you don't need to use this type. It is used internally in `grn_ctx_send()`.

## 7.25.7.2. リファレンス

`grn_content_type`

  指定可能な値は以下の通りです。

  GRN_CONTENT_NONE
    It means that outputting nothing or using the original format. dump uses the type.
  GRN_CONTENT_TSV
    It means tab separated values format.
  GRN_CONTENT_JSON
    JSON形式:
  GRN_CONTENT_XML
    It means XML format.
  GRN_CONTENT_MSGPACK
    It means MessagePack format. You need MessagePack library on building Groonga. If you don't have MessagePack library, you can't use this type.