diff --git a/schemas/enterprise-index.schema.json b/schemas/enterprise-index.schema.json
index e23b9d5..00cff17 100644
--- a/schemas/enterprise-index.schema.json
+++ b/schemas/enterprise-index.schema.json
@@ -25,7 +25,7 @@
         "additionalProperties": false,
         "required": ["ref", "level"],
         "properties": {
-          "ref": { "type": "string", "pattern": "^(\\.\\.?/|package:)[^\\s]+$" },
+          "ref": { "type": "string", "pattern": "^((\\.\\.?/)+|package:)[^\\s]+$" },
           "level": { "type": "integer", "minimum": 1, "maximum": 4 },
           "domain": { "type": "string" },
           "tags": { "type": "array", "items": { "type": "string" } }