The RDM header section begins with a SOIF object whose schema name is RDMHEADER which must contain as least the attributes listed in the following table:
A string identifying the version of the message specification. (for example, 1.0).
A string identifying the nature of this message.
A string which identifies which query language is used in the given request.
A CSID identifying the catalog to which the request/response applies (for example, x-catalog://siroe.budgie.com:80/finance. If not present, the RDM server will use its default catalog.
The following example shows two RDM headers and their attributes:
| @RDMHEADER { -
    rdm-version{3}: 1.0
    rdm-type{14}: status-request
}
@RDMHEADER { -
    rdm-version{3}: 1.0
    rdm-type{10}: rd-request
    rdm-query-language{6}:  search
    catalog-service-ID{39}: x-catalog://budgie.siroe.com:80/finance
} |