Added JSON Schema requirement for non-empty collections/links

This commit also contains minor fixed to the formatting of the spec introduced in #56
opds-community · Apr 17, 2024 · 6c79087 · 6c79087
1 parent 95fc056
commit 6c79087
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Showing 2 changed files with 16 additions and 8 deletions.
diff --git a/opds-2.0.md b/opds-2.0.md
@@ -76,9 +76,9 @@ OPDS 2.0 feeds are identified using the following media type: `application/opds+
 
 <dl>
   <dt><dfn>Blank Value</dfn></dt>
-  <dd>Value encoded in JSON as a `null`, a zero-length string `""`, a zero-length list `[]`, or an object without user-defined properties `{}`.</dd>
+  <dd>Value encoded in JSON as a <code>null</code>, a zero-length string <code>""</code>, a zero-length list <code>[]</code>, or an object without user-defined properties <code>{}</code>.</dd>
   <dt><dfn>Compact Collection</dfn></dt>
-  <dd>Collection containing only Link values as defined in the [Readium Web Publication Manifest](https://github.com/readium/webpub-manifest)</dd>
+  <dd>Collection containing only Link values as defined in the <a href="https://readium.org/webpub-manifest/">Readium Web Publication Manifest</a></dd>
 </dl>
 
 ### 1.3. Conformance Statements

diff --git a/schema/feed.schema.json b/schema/feed.schema.json
@@ -15,6 +15,7 @@
         "$ref": "https://readium.org/webpub-manifest/schema/link.schema.json"
       },
       "uniqueItems": true,
+      "minItems": 1,
       "contains": {
         "properties": {
           "rel": {
@@ -43,7 +44,8 @@
       "items": {
         "$ref": "publication.schema.json"
       },
-      "uniqueItems": true
+      "uniqueItems": true,
+      "minItems": 1
     },
     "navigation": {
       "description": "Navigation for the catalog using links",
@@ -52,6 +54,7 @@
         "$ref": "https://readium.org/webpub-manifest/schema/link.schema.json"
       },
       "uniqueItems": true,
+      "minItems": 1,
       "allOf": [
         {
           "description": "Each Link Object in a navigation collection must contain a title",
@@ -77,11 +80,13 @@
             "items": {
               "$ref": "https://readium.org/webpub-manifest/schema/link.schema.json"
             },
-            "uniqueItems": true
+            "uniqueItems": true,
+            "minItems": 1
           }
         }
       },
-      "uniqueItems": true
+      "uniqueItems": true,
+      "minItems": 1
     },
     "groups": {
       "description": "Groups provide a curated experience, grouping publications or navigation links together",
@@ -97,21 +102,24 @@
             "items": {
               "$ref": "https://readium.org/webpub-manifest/schema/link.schema.json"
             },
-            "uniqueItems": true
+            "uniqueItems": true,
+            "minItems": 1
           },
           "publications": {
             "type": "array",
             "items": {
               "$ref": "publication.schema.json"
             },
-            "uniqueItems": true
+            "uniqueItems": true,
+            "minItems": 1
           },
           "navigation": {
             "type": "array",
             "items": {
               "$ref": "https://readium.org/webpub-manifest/schema/link.schema.json"
             },
-            "uniqueItems": true
+            "uniqueItems": true,
+            "minItems": 1
           }
         },
         "required": [