diff --git a/bibtexbrowser-documentation.wiki b/bibtexbrowser-documentation.wiki
index f22480a..c56a7fa 100755
--- a/bibtexbrowser-documentation.wiki
+++ b/bibtexbrowser-documentation.wiki
@@ -26,7 +26,7 @@ This documentation is collaborative, you can improve it using a [[https://github
 * **(10/2009)** bibtexbrowser is able to generate a bibtex file containing only the selected entries (simply add &astext at the end of the link)
 * **(10/2009)** bibtexbrowser is now independent of the configuration of register_globals
 * **(01/2009)** bibtexbrowser allows multi criteria search, e.g.  [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=monperrus.bib&type=inproceedings&year=20013|demo]]
-* bibtexbrowser generates [[http://ocoins.info/|COinS]] for automatic import of bibliographic entries with [[http://www.zotero.org/|Zotero]] and [[http://www.mendeley.com/|Mendeley]].
+* bibtexbrowser generates [[http://ocoins.info/|COinS]] metadata for automatic import of bibliographic entries with [[http://www.zotero.org/|Zotero]] and [[http://www.mendeley.com/|Mendeley]].
 * bibtexbrowser generates [[http://www.monperrus.net/martin/accurate+bibliographic+metadata+and+google+scholar|Google Scholar metadata]] so as to improve the visibility of your papers on Google Scholar.
 * bibtexbrowser replaces constants defined in @STRING
 * bibtexbrowser is very fast because it keeps a compiled version of the bibtex file (PHP object serialized)
@@ -573,6 +573,18 @@ function bibtexbrowser_top_banner() {
 ?>
 </pre>
 
+====How to configure the type of metadata that bibtexbrowser generates?====
+
+Bibtexbrowser can generate [[https://en.wikipedia.org/wiki/COinS|Coins]], Google Scholar, Dublin Core (DC), Opengraph and Eprints metadata. This can be configured in ''bibtexbrowser.local.php'' as follows:
+<pre>
+&lt;?php
+@define('METADATA_COINS',true); // see https://en.wikipedia.org/wiki/COinS
+@define('METADATA_GS',false); // metadata google scholar, see http://www.monperrus.net/martin/accurate+bibliographic+metadata+and+google+scholar
+@define('METADATA_DC',true); // see http://dublincore.org/
+@define('METADATA_OPENGRAPH',true);  // see http://ogp.me/
+@define('METADATA_EPRINTS',false); // see https://wiki.eprints.org/w/Category:EPrints_Metadata_Fields
+?>
+</pre>
 
 =====Related tools=====
 
diff --git a/bibtexbrowser-test.php b/bibtexbrowser-test.php
index e54fca5..f298d43 100755
--- a/bibtexbrowser-test.php
+++ b/bibtexbrowser-test.php
@@ -284,6 +284,7 @@ class BTBTest extends PHPUnit_Framework_TestCase {
   }
 
   function test_google_scholar_metadata() {
+    bibtexbrowser_configure('METADATA_GS', true);
     $test_data = fopen('php://memory','x+');
     fwrite($test_data, "@article{aKey,title={A Book},author={Martin Monperrus},publisher={Springer},year=2009,pages={42--4242},number=1}\n".
     "@String{x=2008}\n"
diff --git a/bibtexbrowser.php b/bibtexbrowser.php
index e891e64..1e913a6 100755
--- a/bibtexbrowser.php
+++ b/bibtexbrowser.php
@@ -208,10 +208,11 @@ if (defined('ENCODING')) {
 @define('YEAR', 'year');
 @define('BUFFERSIZE',100000);
 @define('MULTIPLE_BIB_SEPARATOR',';');
-@define('METADATA_GS',true);
-@define('METADATA_DC',true);
-@define('METADATA_OPENGRAPH',true);
-@define('METADATA_EPRINTS',false);
+@define('METADATA_COINS',true); // see https://en.wikipedia.org/wiki/COinS
+@define('METADATA_GS',false); // metadata google scholar, see http://www.monperrus.net/martin/accurate+bibliographic+metadata+and+google+scholar
+@define('METADATA_DC',true); // see http://dublincore.org/
+@define('METADATA_OPENGRAPH',true);  // see http://ogp.me/
+@define('METADATA_EPRINTS',false); // see https://wiki.eprints.org/w/Category:EPrints_Metadata_Fields
 
 // define sort order for special values in 'year' field
 // highest number is sorted first
@@ -1812,6 +1813,9 @@ class BibEntry {
    * Used by Zotero, mendeley, etc.
   */
   function toCoins() {
+    if (c('METADATA_COINS') == false) {
+        return;
+    }
     $url_parts=array();
     $url_parts[]='ctx_ver=Z39.88-2004';
 
@@ -1858,7 +1862,7 @@ class BibEntry {
 
     // referrer, the id of a collection of objects
     // see also http://www.openurl.info/registry/docs/pdf/info-sid.pdf
-    $url_parts[]='rfr_id='.s3988('info:sid/'.@$_SERVER['HTTP_HOST'].':'.@$_GET[Q_FILE]);
+    $url_parts[]='rfr_id='.s3988('info:sid/'.@$_SERVER['HTTP_HOST'].':'.basename(@$_GET[Q_FILE]));
 
     $url_parts[]='rft.date='.s3988($this->getYear());
 
@@ -3424,24 +3428,24 @@ class BibEntryDisplay {
   function metadata() {
     $result=array();
 
-    if (BIBTEXBROWSER_ROBOTS_NOINDEX) {
+    if (c('BIBTEXBROWSER_ROBOTS_NOINDEX')) {
       $result[] = array('robots','noindex');
     }
 
-    if (METADATA_GS) {
+    if (c('METADATA_GS')) {
       $result = $this->metadata_google_scholar($result);
     } // end Google Scholar
 
     // a fallback to essential dublin core
-    if (METADATA_DC) {
+    if (c('METADATA_DC')) {
       $result = $this->metadata_dublin_core($result);
     }
 
-    if (METADATA_OPENGRAPH) {
+    if (c('METADATA_OPENGRAPH')) {
       $result = $this->metadata_opengraph($result);
     }
 
-    if (METADATA_EPRINTS) {
+    if (c('METADATA_EPRINTS')) {
       $result = $this->metadata_eprints($result);
     }