A server or a client does not necessarily implement full specifications of OpenXM. If a program sends data unknown to its peer, an unrecoverable error may occur. To avoid such a case OpenXM provides a scheme not to send data unknown to peers. It is realized by exchanging the list of supported CMO and SM. The list is called mathcap. Mathcap is also defined as a CMO and the elements are 32bit integers or strings. The format of mathcap is as follows.
[[version number, server name],SMtaglist, [[OXtag,CMOtaglist],[OXtag,CMOtaglist],...]]
[OXtag,CMOtaglist] indicates that available object tags for a category of data specified by OXtag. For example `ox_asir' accepts the local object format used by Asir and the mathcap from `ox_asir' reflects the fact.
If "ox_check" switch of ctrl is set to 1,
the check by a mathcap is done before data is sent.
If "ox_check" switch of ctrl is set to 0,
the check is not done.
By default it is set to 1.
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