Merge pull request #22 from Language-Research-Technology/datePublishe…

…d_validation

for #21

lib/validator.js

@@ -381,24 +381,26 @@ class Validator {
     let id = "datePublishedFormat"
     let clause = `datePublished: MUST be a string in [ISO 8601 date format][DateTime] and SHOULD be specified to at least the precision of a day, MAY be a timestamp down to the millisecond.`
     if (root?.datePublished) {
-      if (!root.datePublished[0].match(/^\d{4}-?([0]\d|1[0-2])?-?([0-2]\d|3[01])?/)) {
-        this.log(
-          {
-            id,
-            status: "error",
-            message: `datePublished does not start with a compliant date in this format:  YYYY, YYYY-MM or YYYY-MM-DD`,
-            clause
-          }
-        );
-      } else {
-        this.log(
-          {
-            id,
-            status: "success",
-            message: "datePublished is in compliant format.",
-            clause
-          }
-        );
+      for(let dP of root.datePublished) {
+        if (dP && !dP.match(/^\d{4}-?([0]\d|1[0-2])?-?([0-2]\d|3[01])?/)) {
+          this.log(
+            {
+              id,
+              status: "error",
+              message: `datePublished does not start with a compliant date in this format:  YYYY, YYYY-MM or YYYY-MM-DD`,
+              clause
+            }
+          );
+        } else {
+          this.log(
+            {
+              id,
+              status: "success",
+              message: "datePublished is in compliant format.",
+              clause
+            }
+          );
+        }
       }
     }
   }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ro-crate",
-  "version": "3.4.1",
+  "version": "3.4.2",
   "description": "Research Object Crate (RO-Crate) utilities for making and consuming crates",
   "main": "index.js",
   "scripts": {