A serial record can be either a fixed-length or a variable-length record. If it is a variable-length record, you must define the record at its maximum size and specify either the lengthItem property, or the numElementsItem property, or both (see SerialRecord properties).
At generation time, use a ResourceAssociation part to specify how you want a serial record to be implemented for your target platform and provide information about how the fileName property relates to a physical file. For more information, see the EGL Generation Guide.
For information about properties you can assign to a SerialRecord definition, see SerialRecord properties.