Add error behavior for index per usnistgov#549 (usnistgov#551)

aj-stein-nist · Feb 23, 2024 · 6c519a6 · 6c519a6
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diff --git a/website/content/specification/syntax/constraints.md b/website/content/specification/syntax/constraints.md
@@ -195,6 +195,8 @@ An `index` constraint requires that each member entry be unique based upon this
 
 If the evaluation of the Metapath `@target` of the `<key-field/>` does not result in a value, its value for that key in the index is null.
 
+If two entries have the same key computed from the `<key-field>` `@target`s when generating the index, the processor MUST return a processing error.
+
 ## `index-has-key` constraints
 
 The `index-has-key` constraint is a type of Metaschema constraint that cross-references values an existing `index` constraint` with a separate `@target` and `<key-field/>`.