The xs-cim component is a CIM (Common Information Model) plugin, designed and written for the OpenPegasus CIMOM (CIM Object Manager).
Please see the XenServer openpegasus git repository which contains a number of patches required for fully supporting this plugin.
https://github.com/xenserver/openpegasus
When installed onto a XenServer host, the plugin allows management of the host via the CIM protocol.