From GridLAB-D Wiki
sanitize_index - Specifies the name of the sanitize index output file.
Synopsis
host% gridlabd -D|--define sanitize_index=spec
Remarks
If the spec begins with a period, then it is considered only a formatting hint. The current modelname is used as the index name, with the string "-index.type" appended. Only ".xml" and ".txt" are supported.
If the spec is an empty string, no index file is produced.