Pronom URLs were not working for Siegfried 1.7.8 because of a change to the

Json/YAML properties in 1.5.0 - fixed this but it needs to be tested with an
older Siegfried

lib/item.js

@@ -183,17 +183,25 @@ module.exports = function() {
         //console.log("FILE", this.is_file, this.collection.file_info_by_filename[this.is_file].filesize)
         prop.parse("contentSize", String(file_info.filesize));
         this.properties[prop.name] = prop;
+        //console.log("file_info\n" + JSON.stringify(file_info));
 
-        if (file_info.matches[0].id === "pronom") {
+        var fi = file_info.matches[0]
+
+        /* Siegfried v1.4.5 and earlier used id "pronom" and puid "fmt/44"
+           (for example). v1.5.0 and later use ns "pronom" and id "fmt/44".
+
+           Pick which one to use based on which of ns / id is defined
+        */
+
+        if ( fi.ns === "pronom" || fi.id === "pronom" ) {
           var pronom = new metadata_property_name();
+          const id = fi.ns ? fi.id : fi.puid;
           pronom.parse(
             "fileFormat",
-            "http://www.nationalarchives.gov.uk/PRONOM/" +
-              file_info.matches[0].puid
+            "http://www.nationalarchives.gov.uk/PRONOM/" + id
           );
           this.properties[pronom.name] = pronom;
-          //console.log("PRONOM NAME", pronom.name);
-        }
+        } 
 
         var name_prop = new metadata_property_name();
         name_prop.parse("encodingFormat", file_info.matches[0].format);