// - Do not test unknow VM in shadow groups (if element 0x0000 is present)
// - Skip Sequences (if they are 'True Length'); loading will be quicker
// (anyway, Sequences are skipped at processing time ...)
// - Do not test unknow VM in shadow groups (if element 0x0000 is present)
// - Skip Sequences (if they are 'True Length'); loading will be quicker
// (anyway, Sequences are skipped at processing time ...)