Field Name in Container
Defines the name under which the form element will be saved in the data container. If the Field Name in Container remains empty, then the field identifier (name) will be used. If two form elements share the same Field Name in Container, then both will access the same value.
If the option Show Label Inline is used at the same time, the field label remains visible in the input field until the user has made an entry or a value different from the empty string has been read from the container.