ESPD Request cardinalities
As you can see the UBL-2.3 Schema is quite flexible as, except for a few cases practically all the elements are optional.
The ESPD-EDM model, however, adds a few more restrictions regarding the cardinalities of some elements. These can be seen in the diagram below, which presents the ESPD-EDM structure for the ESPD Request with its own cardinality restrictions.
Figure 12. ESPD-EDM 'QualificationApplicationRequest', UML diagram
If you compare both figures you will observe that:
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The cardinalities of the root common basic components, such as cbc:ID, cbc:UUID, are different for the ESPD than for UBL-2.3;
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Similarly, the cardinalities of aggregate components like cac:ContractingParty and cac:TenderingCriterion are different to the UBL-2.3 ones.
The cardinality constraints added by the ESPD are not defined in the XSD Schema. In order to control these constraints the ESPD-EDM uses ISO Schematron assertions. The ESPD-EDM distribution package provides Schematron schemata and CVA files for the validation of the XML instances (folder /validation).
