| index.default | R Documentation | 
Given a cell class create an index representation. If no source is specified no index will be generated.
## Default S3 method: index(object, id = "tangram", name = NULL, key.len = 4, ...)
| object | cell; The cell for indexing | 
| id | character; an additional specifier for the object key | 
| name | character; optional names of elements inside object | 
| key.len | numeric; length of generated key | 
| ... | additional arguments to renderer. Unused | 
A list of strings containing key, source and value
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