Fix #927737 (add other identifiers to catalog output)

src/calibre/customize/__init__.py

@@ -449,7 +449,7 @@ class CatalogPlugin(Plugin): # {{{
                           ['author_sort','authors','comments','cover','formats',
                            'id','isbn','ondevice','pubdate','publisher','rating',
                            'series_index','series','size','tags','timestamp',
-                           'title_sort','title','uuid','languages'])
+                           'title_sort','title','uuid','languages','identifiers'])
         all_custom_fields = set(db.custom_field_keys())
         for field in list(all_custom_fields):
             fm = db.field_metadata[field]

src/calibre/library/catalogs/__init__.py

@@ -11,7 +11,7 @@ __docformat__ = 'restructuredtext en'
 FIELDS = ['all', 'title', 'title_sort', 'author_sort', 'authors', 'comments',
           'cover', 'formats','id', 'isbn', 'ondevice', 'pubdate', 'publisher',
           'rating', 'series_index', 'series', 'size', 'tags', 'timestamp',
-          'uuid', 'languages']
+          'uuid', 'languages', 'identifiers']
 
 #Allowed fields for template
 TEMPLATE_ALLOWED_FIELDS = [ 'author_sort', 'authors', 'id', 'isbn', 'pubdate', 'title_sort',

src/calibre/library/catalogs/csv_xml.py

@@ -162,7 +162,7 @@ class CSV_XML(CatalogPlugin):
                         record.append(item)
 
                 for field in ('id', 'uuid', 'publisher', 'rating', 'size',
-                              'isbn','ondevice'):
+                              'isbn','ondevice', 'identifiers'):
                     if field in fields:
                         val = r[field]
                         if not val: