The skeleton library contains the JCL and file tailoring control statements that are used to generate the JCL for a particular Batch option. A primary skeleton is associated with each option. This skeleton embeds other skeletons based on input data set type. For option 1, for example, skeleton ISRJS01 is used. If the data set was defined in the ISPF library section of the panel, ISRJS01 embeds skeleton ISRJS01I for appropriate JCL. If an "other" partitioned data set were specified, skeleton ISRJS01P would be embedded. If an "other" sequential data set were specified, skeleton ISRJS01S would be embedded.