Expose annotations and error messages for JSON-LD-Star

Author: rubensworks

lib/ErrorCoded.ts

@@ -75,4 +75,10 @@ export enum ERROR_CODES {
   INVALID_BASE_DIRECTION = 'invalid base direction',
   RECURSIVE_CONTEXT_INCLUSION = 'recursive context inclusion',
   INVALID_STREAMING_KEY_ORDER = 'invalid streaming key order',
+
+  /**
+   * JSON-LD-star
+   */
+  INVALID_EMBEDDED_NODE = "invalid embedded node",
+  INVALID_ANNOTATION = "invalid annotation",
 }

lib/Util.ts

@@ -19,6 +19,7 @@ export class Util {
   // All known valid JSON-LD keywords
   // @see https://www.w3.org/TR/json-ld11/#keywords
   public static readonly VALID_KEYWORDS: {[keyword: string]: boolean} = {
+    '@annotation': true, // https://json-ld.github.io/json-ld-star/
     '@base': true,
     '@container': true,
     '@context': true,