We allow multiple representations for each property in the data model. Although most properties have only a single representation, there are several that have multiple representations. In such a case, we use that dot notation to separate the property name from the representation.
The value after the dot is a qualifier, which identifies the representation. For example, the property j:BondRevokeDate is alway of type j-xsd:date, but the property j:BondIssuer can either be of type j:PersonType or j:OrganizationType. So we use the qualifier Person for j:PersonType, and we use Organization for j:OrganizationType.
This results in two, strongly typed, elements: j:BondIssuer. Person and j:BondIssuer.Organization. More.
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