An entry field is a rectangular box into which the user types textual information in a single line. Data input in an entry field can be checked by defining a validation criteria. Use the validation is clause in the entry field definition to specify the type and range of validation you need. (See entry field Definition in the Reference Guide for information on using the validation is clause.)

You can define a more complex validation criteria by using the on validation clause. (For restrictions on using this clause and the on validation error-handling clause, see response to OBJECT Response Definition in the Reference Guide.)