- cql:cql_atomic_value_check_hook(+Value)can be defined 
to declare new’atomic’types (That is, types which can be 
written directly to the database), such as a representation likeboolean(true)for 1.
- cql:cql_check_value_hook(+Value)can be used to check 
that a value is legal
- cql:application_value_to_odbc_value_hook(+OdbcDataType, +Schema, +TableName, +ColumnName, +Qualifiers, +ApplicationValue, -OdbcValue).
- cql:odbc_value_to_application_value_hook(+OdbcDataType, +Schema, +TableName, +ColumnName, +Domain, +OdbcValue, -ApplicationValue).