Sentence examples for this field is optional from inspiring English sources

If the application-layer mediator synthesis tool is unaware that this field is optional, it may fail to map an operation between components because a required input is not provided.

So as to not affect the integrity of the RInChI standard it is proposed that the reaction information is appended to the existing RInChI string and that this field is optional as far as the standard is concerned.

The personal information posted on your profile isn't very personal - every field is optional, and you can be as vague as you like (e.g. Location could be "UK" rather than "King's Cross, London").

The "Link URL" Field is optional.

In SFC, all the fields are optional, but at least one of them should be filled.

To create a task, you enter a name, a due date, any contacts you'd like to delegate the task to, and relevant tags (most of these fields are optional).

Neither page requires extensive data entry, with many of the fields being optional.

Birth month, day and gender fields are optional, but if you want to provide this information, it enables Bookboard to personalize the reading experience more closely to your child's age and possible interests.

Both the bio and location fields are optional, but everything else, you need to fill out (unless you click on "Ask me later" which presumably will bring up this prompt again).

All personal information fields are optional.

Some fields are optional, so if for instance the read name does not follow 454 encoding conventions, no Info field will be present.