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## <hello>

#### Usage

`

    <!- - emitted by a client application - ->
    <hello>
        <capabilities>
            <capability>URI</capability>
        </capabilities>
    </hello>
    ]]>]]>

    <!- - emitted by the NETCONF server - ->
    <hello>
        <capabilities>
            <capability>URI</capability>
        </capabilities>
        <session-id>session-identifier</session-id>
    </hello>
    ]]>]]>

`

#### Description

Specify which operations, or capabilities, the emitter supports from among those defined in the NETCONF specification. The client application must emit the <hello> tag element before any other tag element during the NETCONF session, and must not emit it more than once.

<capabilities>—Encloses one or more <capability> tags, which together specify the set of supported NETCONF operations.

<capability>—Specifies the uniform resource identifier (URI) of a capability defined in the NETCONF specification or by a vendor. Each capability from the NETCONF specification is represented by a uniform resource name (URN). Capabilities defined by vendors are represented by URNs or URLs. For a list of the capabilities supported by the NETCONF server for the SRC software, see Exchanging <hello> Tag Elements.

<session-id>—(Generated by NETCONF server only) Specifies the process ID (PID) of the NETCONF server for the session.

#### Usage Guidelines

See Exchanging <hello> Tag Elements.

#### Related Topics

]]>]]>

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