properties.prependOptionValue
-----------------------------

:aspect:`Option path`
      TYPO3.CMS.Form.prototypes.<prototypeIdentifier>.formElementsDefinition.MultiSelect.properties.prependOptionValue

:aspect:`Data type`
      string

:aspect:`Needed by`
      Frontend/ Backend (form editor)

:aspect:`Overwritable within form definition`
      Yes

:aspect:`form editor can write this property into the form definition (for prototype 'standard')`
      No

:aspect:`Mandatory`
      No

:aspect:`Default value (for prototype 'standard')`
      undefined

.. :aspect:`Good to know`
      ToDo

:aspect:`Description`
      If set, this value will be set for the first select-option.