Constraint
From DGIWG
								
												
				The following metadata elements are applicable to all resources
| Identifier | Title / Description | Value Domain | Card | Condition | Guidelines | Example | 
|---|---|---|---|---|---|---|
| RSSCST [DMF/Core] | Resource Security Constraint This element provides a means to express a set of security constraints applicable to the resource | Security Constraint | 0..* | If the classification used is a national classification, ISO 3-letter code should be used for MDSCST.system | MDSCST.level = unclassified   | |
| RSREL [DMF/Defence] | Resource Releasability This element provides a means to express a set of releasability information applicable to the resource. | Releasability | 0..* | To be compatible with NATO requirements, the String value should be an ISO 3-letter code. | GBR,FRA,DEU | |
| RSUSE [DMF/Core] | Resource Use Limitation This element provides a means to express general use limitations (limitations not implied by security or legal constraints) of the resource. | Free Text | 0..* | Standardized phrases could be considered based on known products and/or output. | Defence purposes only | |
| RSLCST [DMF/Core] | Resource Legal Constraint This element provides a means to express a set of legal constraints applicable to the resource. | Legal Constraint | 0..* | 
