diff --git a/sql/V6.0.9.1__Seo_set_some_fields_nullable.sql b/sql/V6.0.9.1__Seo_set_some_fields_nullable.sql
new file mode 100644
index 0000000..dd84c06
--- /dev/null
+++ b/sql/V6.0.9.1__Seo_set_some_fields_nullable.sql
@@ -0,0 +1,7 @@
+
+ALTER TABLE `seo_sitemap_link` CHANGE `title` `title` varchar(50) DEFAULT '';
+ALTER TABLE `seo_sitemap_link` CHANGE `description` `description` varchar(200) DEFAULT '';
+ALTER TABLE `seo_sitemap_link` CHANGE `lastmod` `lastmod` datetime DEFAULT '0000-00-00 00:00:00';
+ALTER TABLE `seo_sitemap_link` CHANGE `changefreq` `changefreq` varchar(16) DEFAULT '';
+ALTER TABLE `seo_sitemap_link` CHANGE `priority` `priority` decimal(32,8) DEFAULT '0.00000000';
+
diff --git a/src/Seo/SitemapLink.php b/src/Seo/SitemapLink.php
index 3ba0472..527b362 100644
--- a/src/Seo/SitemapLink.php
+++ b/src/Seo/SitemapLink.php
@@ -80,64 +80,48 @@ function init()
         $this->_a['cols'] = array(
             'id' => array(
                 'type' => 'Sequence',
-                'blank' => true,
-                'verbose' => 'unique and no repreducable id fro reception'
             ),
             'title' => array(
                 'type' => 'Varchar',
-                'blank' => true,
+                'is_null' => true,
                 'size' => 50,
                 'editable' => true,
                 'readable' => true
             ),
             'description' => array(
                 'type' => 'Varchar',
-                'blank' => true,
+                'is_null' => true,
                 'size' => 200,
                 'editable' => true,
                 'readable' => true
             ),
             'loc' => array(
                 'type' => 'Varchar',
-                'blank' => false,
+                'is_null' => false,
                 'size' => 2048,
                 'editable' => true,
                 'readable' => true
             ),
             'lastmod' => array(
                 'type' => 'Datetime',
-                'blank' => true,
+                'is_null' => true,
                 'verbose' => 'last modification date',
                 'editable' => true,
                 'readable' => true
             ),
             'changefreq' => array(
                 'type' => 'Varchar',
-                'blank' => true,
+                'is_null' => true,
                 'size' => 16,
                 'editable' => true,
                 'readable' => true
             ),
             'priority' => array(
                 'type' => 'Float',
-                'blank' => true,
+                'is_null' => true,
                 'editable' => true,
                 'readable' => true
             ),
-//             'creation_dtime' => array(
-//                 'type' => 'Datetime',
-//                 'blank' => true,
-//                 'verbose' => 'creation date',
-//                 'editable' => false,
-//                 'readable' => true
-//             ),
-//             'modif_dtime' => array(
-//                 'type' => 'Datetime',
-//                 'blank' => true,
-//                 'verbose' => 'modification date',
-//                 'editable' => false,
-//                 'readable' => true
-//             )
         );
     }