Example of CHOICE with only one item. A choice with one item may simulate a [zero or at least n] constraint, in this case n is 2 Required [element], Multiple Occurrence, with Simple Type [anySimpleFieldType:http://www.eleusoft.org/osk] localName is [TwoEMails] without namespace Example of CHOICE with only one item. A choice with one item may simulate a [zero or at least n] constraint, in this case n is 2