Analysis of information sources in references of the Wikipedia article "Job Control Language" in English language version.
Data set names must not exceed 44 characters, including all name segments and periods.
JCL in particular is notoriously user hostile and has been called "the worst programming language ever designed" by Fred Brooks ... (http://dtsc.dfw.ibm.com/MVSDS/'HTTPD2.APPS.ZOSCLASS.PDF(ZCLA...)[link in original].