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formalism uses standard regular expression notation [ 2 ] for component content. component content corresponds roughly to a union of both model groups and attributes groups. in what follows, g stands for a content group (as does g1, g2, and so on). the constructors for groups include the following: e empty
sequence o empty choice g1,g2 sequence, g1 followed by g2 g1 | g2 choice, g1 or g2 g1 & g2 all, g1 and g2 in either order g{m,n} repetition, g repeated between minimum m and maximum n times (m is a natural number, n is a natural number or 8) mixed(g) mixed content in group g @w[g] attribute, with name...
http://www.w3.org/TR/2001/WD-xmlschema-formal-20010925/