EDS service, how to provide external data when using Content Navigator

According to the official IBM redbook related to Content Navigator, the External Data Services (a.k.a. EDS) is “an interface that IBM Content Navigator provides to access data from external data sources. EDS can be used to define field validation criteria, prefill the field values, or other custom properties for existing repository metadata during delivery or change of documents or folders.”. Actually, this is a more powerful aplication service than that.

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