Fix opds format errors & extend info

cps/templates/feed.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<feed xmlns="http://www.w3.org/2005/Atom" xmlns:dcterms="http://purl.org/dc/terms/">
+<feed xmlns="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/terms/">
   <id>urn:uuid:2853dacf-ed79-42f5-8e8a-a7bb3d1ae6a2</id>
   <updated>{{ current_time }}</updated>
   <link rel="self"
@@ -49,18 +49,24 @@
       </author>
     {% endif %}
     {% if entry.publishers.__len__() > 0 %}
-      <publisher>
+      <dc:publisher>
         <name>{{entry.publishers[0].name}}</name>
-      </publisher>
+      </dc:publisher>
+    {% endif %}
+    {% if entry.pubdate %}
+      <dc:issued>{{entry.pubdate}}</dc:issued>
     {% endif %}
     {% for lang in entry.languages %}
-      <dcterms:language>{{lang.lang_code}}</dcterms:language>
+      <dc:language>{{lang.lang_code}}</dc:language>
     {% endfor %}
     {% for tag in entry.tags %}
     <category scheme="http://www.bisg.org/standards/bisac_subject/index.html"
               term="{{tag.name}}"
               label="{{tag.name}}"/>
     {% endfor %}
+    {% for identifier in entry.identifiers %}
+    <dc:identifier>{{identifier.val}}</dc:identifier>
+    {% endfor %}
     {% if entry.comments[0] %}<summary>{{entry.comments[0].text|striptags}}</summary>{% endif %}
     {% if entry.has_cover %}
     <link type="image/jpeg" href="{{url_for('opds.feed_get_cover', book_id=entry.id)}}" rel="http://opds-spec.org/image"/>
@@ -68,7 +74,7 @@
     {% endif %}
     {% for format in entry.data %}
     <link rel="http://opds-spec.org/acquisition" href="{{ url_for('opds.opds_download_link', book_id=entry.id, book_format=format.format|lower)}}"
-          length="{{format.uncompressed_size}}" mtime="{{entry.atom_timestamp}}" type="{{format.format|lower|mimetype}}"/>
+          length="{{format.uncompressed_size}}" type="{{format.format|lower|mimetype}}"/>
     {% endfor %}
   </entry>
   {% endfor %}