Model definition of cross-domain resources

An alternative method of defining cross-domain resources is with a model CDRSC definition, which can be used as the definition for one or more CDRSCs. You code a model CDRSC definition by placing wildcard characters in the name field of a CDRSC definition statement that defines characteristics for one or more CDRSCs.

If VTAM® cannot find an existing definition for a CDRSC, it searches a list of model CDRSC definitions to find the pattern that best matches the name of the cross-domain resource. If VTAM finds a match, it uses that model definition statement to build the definition for the cross-domain resource. If it does not find a match, it attempts to create a dynamic CDRSC, if dynamics are allowed. Model CDRSC definitions enable you to reduce the number of CDRSC definitions you must code in VTAMLST, when dynamic CDRSCs are not an option or are otherwise undesirable.

Model CDRSC definitions can have any keyword specified on them that can be specified on a static CDRSC, which gives you the ability to have different sets of CDRSCs with different characteristics (for example, you might have one model CDRSC coded with DLOGMOD=BATCH and another one coded with DLOGMOD=INTERACT). A CDRSC that is built from a model CDRSC definition is called a clone CDRSC. The clone CDRSC is added to the same CDRSC major node in which the model CDRSC was defined and the clone CDRSC has all the characteristics of the model CDRSC. It is treated as a predefined CDRSC in that any operation that can be done on a predefined CDRSC can be done on a clone CDRSC.

Note: Any information in this publication related to a predefined CDRSC can be assumed to include building a clone CDRSC from an appropriate predefined model CDRSC.

The building of a clone CDRSC is not dependent on the coding of CDRDYN (as a start option or on a CDRM definition statement), nor is it subject to the coding of the CDRSC parameter on the CDRM definition statement. The activation or updating of a model CDRSC does not have any effect on any existing clone CDRSC.

For additional information about modeling cross-domain resources, see Model definition of VTAM cross-domain resources in z/OS Communications Server: SNA Resource Definition Samples.