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Element Description
The specific URL to the back-end service. A back-end service refers to any of the following types of services: (1) a service that permits user selection of service options for data transformations which are provided by the service(s) for any given collection; (2) a web service that uses standards-based protocols i.e. Open-source Project for a Network Data Access Protocol (OPeNDAP), Web Coverage Services (WCS), and Web Mapping Services (WMS); or (3) a web service that performs data processing., e.g., spatial subsetting, reprojection, reformatting, etc. These back-end services are available programmatically through APIs and generally consumed by front-end clients.
Best Practices
The URL should provide a direct link to the location on the web where the service may be accessed. While not required, it is highly recommended that a description be provided for the URL provided in the metadata. The description should be kept brief and explain to the user that the link goes directly to the back-end service.
Examples:
- OPeNDAP example:
- Description: Access to OPeNDAP protocol for GLDAS datasets.
- URL Value: https://hydro1.gesdisc.eosdis.nasa.gov/opendap/GLDAS/contents.html
- SEDAC Hazards mapper example:
- Description: Access the SEDAC Hazards mapper
URL Value: https://sedac.ciesin.columbia.edu/mapping/hazards/
- Description: Access the SEDAC Hazards mapper
Element Specification
Model | Element | Type | Constraints | Required | Cardinality | Notes |
---|---|---|---|---|---|---|
UMM-S | URL/Description | String | 1-4000 characters | No | (0..1) | |
UMM-S | URL/URLValue | String | 1-1024 characters | Yes | (1) |
Metadata Validation
All records undergo CMR schema and business rule validation before entering the system.
- The 'URLValue' element is required.
- Must contain at least 1 character and be no longer than 1024 characters in length.
- The 'Description' element must contain at least 1 character and be no longer than 4000 characters in length.
History
UMM Versioning
Version | Date | What Changed |
---|---|---|
1.5.0 | 2022-04-22 | First version published on wiki |