| description | Description | Example |
|---|---|---|
Required: True Units: None Type: string Style: free form Default: None |
description of where the external URL points towards | IRIS DMC Metadata |
| url | Description | Example |
|---|---|---|
Required: True Units: None Type: string Style: url Default: None |
full URL of where the data is stored | http://www.iris .edu/mda/EM/NVS 11 |