8.3.4.6 Multiple Value Matching

8.3.4.6 Multiple Value Matching (Current)
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A single parameter specifies whether Multiple Value Matching is to be performed.

This parameter is optional for the user agent.

This parameter is optional for the origin server.

If this parameter is not present its value is "false".

multiplevaluematching = "multiplevaluematching" "=" ("true" / "false")

If the value is "false", then the search shall be performed without Multiple Value Matching.

If the value is "true" and the origin server supports Multiple Value Matching, then the search shall be performed with Multiple Value Matching Attributes as specified in Section C.2.2.2.8 “Multiple Value Matching” in PS3.4 and shall be documented in the Conformance Statement and, if the service supports it, the Retrieve Capabilities response.

If the value is "true" and the origin server does not support Empty Value Matching, then:

The search shall be performed without Multiple Value Matching.
The response shall include the following HTTP Warning header (see [RFC7234] Section 5.5):
```
Warning: 299 <service>: The multiplevaluematching parameter is not supported. Multiple Value Matching has not been performed.
```
where <service> is the base URI for the origin server. This may be a combination of scheme, authority, and path.
The response may include a payload containing an appropriate Status Report.

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8.3.4.5 Empty Value Matching	Home	8.3.5 Rendering Query Parameters