In the field of electronic health records (EHR), Cross Enterprise Document Sharing (XDS) is a system of standards for cataloging and sharing patient records across health institutions.
[1] XDS provides a registry for querying which patient records are in an EHR repository and methods for retrieving the documents.
[2] XDS uses structured EHR standards such as Continuity of Care Record (CCR) and Clinical Data Architecture (CDA) to facilitate data exchange.
[3] There may be multiple repositories of documents indexed,[4] but only one registry per clinical domain.
There have also been XDS standards XDS-I and XDS-b developed for electronic imaging records.