An identifier for the institution having custody of the object(s) or information referred to in the record.

`http://biocol.org/urn:lsid:biocol.org:col:34777`, `http://grbio.org/cool/km06-gtbn`

For physical specimens, the recommended best practice is to use an identifier from a collections registry such as the Global Registry of Biodiversity Repositories (http://grbio.org/).

Institution ID