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| Keyword | reference (extend) | 
| Purpose | Extend the property with a new attribute of type reference. A reference is a URL and an optional text that will be shown instead of the URL if needed. | |
| Syntax | reference <id> <name> [{ <attributes> }] | |
| Arguments | id [ID] | The ID of the new attribute. It can be used like the built-in IDs. | 
| name [STRING] | The name of the new attribute. It is used as header in report columns and the like. | |
| Context | extend | |
| Attributes | inherit (extend), scenariospecific (extend) | 
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