private void importIdentifiers(
      @NotNull IdentifiersMapping idMapping, ValueTable sourceTable, @Nullable String select) {

    Variable variable = identifiersTableService.ensureIdentifiersMapping(idMapping);
    String selectScript =
        select == null //
            ? variable.hasAttribute("select")
                ? variable.getAttributeStringValue("select")
                : null //
            : select;

    ValueTable sourceIdentifiersTable =
        identifierService.createPrivateView(sourceTable.getName(), sourceTable, selectScript);
    Variable identifierVariable =
        identifierService.createIdentifierVariable(sourceIdentifiersTable, idMapping);

    PrivateVariableEntityMap entityMap =
        new OpalPrivateVariableEntityMap(
            identifiersTableService.getIdentifiersTable(idMapping.getEntityType()),
            identifierVariable,
            participantIdentifier);

    try (ValueTableWriter identifiersTableWriter =
        identifiersTableService.createIdentifiersTableWriter(idMapping.getEntityType())) {
      for (VariableEntity privateEntity : sourceIdentifiersTable.getVariableEntities()) {
        if (entityMap.publicEntity(privateEntity) == null) {
          entityMap.createPublicEntity(privateEntity);
        }
        identifierService.copyParticipantIdentifiers(
            entityMap.publicEntity(privateEntity),
            sourceIdentifiersTable,
            entityMap,
            identifiersTableWriter);
      }
    }
  }