- Patch #332980 by scor: added an RDF namespace registry. Oh my ... :-)

2 files changed, 17 insertions, 0 deletions

diff --git a/includes/common.inc b/includes/common.inc
index e944ca300..76eac625b 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -113,6 +113,18 @@ function drupal_get_breadcrumb() {
 }
 
 /**
+ * Returns a string containing RDF namespaces for the html tag of a XHTML page.
+ */
+function drupal_get_rdf_namespaces() {
+  // Serialize the RDF namespaces used in RDFa annotation.
+  $xml_rdf_namespaces = array();
+  foreach (module_invoke_all('rdf_namespaces') as $prefix => $uri) {
+    $xml_rdf_namespaces[] = 'xmlns:' . $prefix . '="' . $uri . '"';
+  }
+  return implode("\n  ", $xml_rdf_namespaces);
+}
+
+/**
  * Add output to the head tag of the HTML page.
  *
  * This function can be called as long the headers aren't sent.
diff --git a/includes/theme.inc b/includes/theme.inc
index d2eedcf80..00b8b50af 100644
--- a/includes/theme.inc
+++ b/includes/theme.inc
@@ -1881,6 +1881,11 @@ function template_preprocess_page(&$variables) {
   $variables['scripts']           = drupal_get_js();
   $variables['tabs']              = theme('menu_local_tasks');
   $variables['title']             = drupal_get_title();
+  // RDFa annotatates XHTML with RDF data, while GRDDL provides
+  // mechanisms for extraction of this RDF content via XSLT transformation
+  // using an associated GRDDL profile.
+  $variables['rdf_namespaces']    = drupal_get_rdf_namespaces();
+  $variables['grddl_profile']     = 'http://ns.inria.fr/grddl/rdfa/';
   // Closure should be filled last.
   $variables['closure']           = theme('closure');