However, a big block stand on our way is the existing identifiers in databases.
Prior to registering a new model, one can decide to use existing identifiers and names or add their own identifiers and name to the ontology.
We considered whether concatenation of existing identifiers, particularly surname, forename and date of birth, might offer an identifier of high cardinality with potential to act as a unique identifier, using records in the PAS data source having NHS numbers.
For the purposes of these guidelines, "coded" is taken to mean removal of all existing identifiers as far as is compatible with usefulness of the data and substitution by proxy identifiers that are used in the database.
The existing Cluster Identifier of the dividing cluster, or of the cluster to where the new one is attached, is kept unchanged becoming a Virtual Cluster.
To retrieve patient identifiers (i.e. pseudonyms), PIX/PDQ provides "PIX query", but this transaction does not accept IDAT; rather, it requires the sender to provide an existing patient identifier.
The transaction "Patient Identity Feed", by which a patient is registered at the PIX provider, does not return a result and requires an existing patient identifier to be transmitted in the request.
If these identifiers were not available, we used other existing chemical identifiers from ChEBI (Chemical Entities of Biological Interest) and KEGG ID.
Identifiers.org (Juty et al., 2012) provides resolvable persistent IRIs used to identify individual records (based on the existing entity identifiers assigned directly by the data providers).
> -wrap-foot> The new identifiers were set-up to be similar to, but easily distinguishable from, existing MEROPS identifiers.
