John Geleynse The Custom Element
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Edit properties of a custom element

Custom elements don't have many settings. They refer to a script of type "data type" that can be edited in the script editor. The referenced script implements both parsing of some data in a file as well as translating changes back to the file.

Optionally you can specify an expression to compute the length of a custom element. This length will be passed to the parsing script method if it is smaller than the remaining space in the file.

Custom element in grammar editor

See also

How are the structures mapped?
The Reference document