genomic feature set allele set 'Sets' are used to model entities that can be comprised of multiple discrete elements - but which can also contain zero or a single member. An "Allele Set' represents any collection of 0 or more discrete alleles found within a particular genome. The alleles in such a set can be located at distant or close locations in the genome, and if on the same chromosome can be in trans, in cis, or even overlapping When the members of such a set are found 'in cis' on the same chromosome, they may constitute a 'haplotype'. When found 'in trans' at the same location on homologous chromosomes, they may constitute a 'single locus complement'. A set of discrete alleles within a particular genome.