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DAS registry help - validation

The registration server contains a validation mechanism, to make sure that a registered DAS source "speaks" proper DAS. When registering a new service an accession code (segment id) needs to be provided. This is used to create a DAS request and validate the response. A service can only be registered if the provided accession code returns a DAS response that contains data.

The first time validation is performed is during the initial registration procedure, then every two hours to ensure that the source is still available.

If a DAS source can not be validated for more than two days, then a watchdog functionality can send a notification to the DAS source administrator. This features needs to be opted-in during registration.

Problems during validation

A common problem during the validation of DAS servers is that a DAS response turns out not to be valid XML. A frequent cause for this is the use of the & character in the LINK field of a DAS response. According to the XML specification & is a special character and needs to be protected, e.g. by writing is as &

Let us know if you have any problems with the validation of your DAS servers.