Value-based schema constraints

Enum property validation

For enum attributes, the format field is interpreted as a comma-separated list of possible values. For example, “small, medium, large” defines an enum property that can only be set to one of those three values.

String property validation

For string attributes, the format is interpreted as a regular expression that validates input. All values written to the attribute must match this regular expression pattern.

Numeric property validation

For numeric attributes, the format specifies a valid range using mathematical interval notation, allowing you to enforce that input values fall within a certain interval. For example, [2,100[ accepts values from 2 (inclusive) to 100 (exclusive).

Date property validation

For date attributes, the format specifies a date pattern following Java’s SimpleDateFormat specification. This allows you to accept date strings in custom formats beyond the default ISO-8601 format while still writing the millisecond-precision long value into the database.