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When putting a string in metadata sidecar that has the pattern #{...} it will be evaluated using the Spring Expression Language. Inside an expression, you can reference the metadata using R(<Dotted key>) or record(<Dotted key>) for example R('Descriptive.Title') or record('Descriptive.Title').

Info
The `R` takes an optional second argument, which is the default value when the metadata field is not present.

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When the templated sidecar is evaluated against a record it will result for example in the following metadata sidecar

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Level	Case	Effect	Example Expression	Example Output
Top	SimpleField	String	`R('Descriptive.Title')`	`My title`
Top	ListField	List of Strings	`R('Descriptive.Keywords')`	`["A", "B", "C"]`
Top	MapField	Map of Strings	`R('Structural.Versioning')`	`{"Status": "HEAD", "Version": "2"}`
Top	MultiItemField	Map of List of Strings	`R('Descriptive.Authors')`	`{"Authors": ["Cedric"], "Director": ["Alice", "Bob"]}`
Top	Others	Not allowed
Sub	Child of ListField	List of Strings	`R('Descriptive.Keywords.Keyword')`	`["A", "B", "C"]`
Sub	Child of MultiItemField	List of Strings	`R('Descriptive.Authors.Director')`	`["Alice", "Bob"]`
Sub	Child of MapField	String	`R('Structural.Versioning.Status')`	`HEAD`
Sub	Other	Not allowed

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Output after evaluating the expression

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Old Version 2

New Version 3

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Output after evaluating the expression