diff --git a/src/oaipmh-expose/class-tainacan-oaipmh-expose.php b/src/oaipmh-expose/class-tainacan-oaipmh-expose.php
index 79ae52fa3..00890446c 100644
--- a/src/oaipmh-expose/class-tainacan-oaipmh-expose.php
+++ b/src/oaipmh-expose/class-tainacan-oaipmh-expose.php
@@ -26,6 +26,8 @@ class OAIPMH_Expose {
     var $xmlescaped;
     var $text;
     var $code;
+    var $token_valid;
+    var $token_prefix;
 
     /**
      *
@@ -68,25 +70,21 @@ class OAIPMH_Expose {
          * If there are more records to deliver
          * a ResumptionToken will be generated.
          */
-        $this->MAXRECORDS = 100;
-
-        /** Maximum mumber of identifiers to deliver
-         * (verb is ListIdentifiers)
-         * If there are more identifiers to deliver
-         * a ResumptionToken will be generated.
-         */
-        define('MAXIDS', 100);
+        $this->MAXRECORDS = has_filter( 'tainacan-oai-maxrecords' ) ?  apply_filters('tainacan-oai-maxrecords', 100) : 100;
 
         /** After 24 hours resumptionTokens become invalid. Unit is second. */
-        define('TOKEN_VALID', 24 * 3600);
-        define('MY_URI',  get_bloginfo( 'url' ));
+        $this->token_valid = has_filter( 'tainacan-oai-token-valid' ) ?  apply_filters('tainacan-oai-token-valid', 24 * 3600) : 24 * 3600;
 
-        $this->expirationdatetime = gmstrftime('%Y-%m-%dT%TZ', time() + TOKEN_VALID);
+        if ( !defined('TAINACAN_OAI_REPOSITORY_URL') ) {
+            define('TAINACAN_OAI_REPOSITORY_URL', get_bloginfo( 'url' ));
+        }
+
+        $this->expirationdatetime = gmstrftime('%Y-%m-%dT%TZ', time() + $this->token_valid);
 
         /** Where token is saved and path is included */
         $token_path = $this->create_token_dir();
         if($token_path){
-            define('TOKEN_PREFIX', $token_path);
+            $this->token_prefix = $token_path;
         }
 
         $this->METADATAFORMATS = array(
@@ -98,13 +96,11 @@ class OAIPMH_Expose {
                 'record_namespace' => 'http://purl.org/dc/elements/1.1/'
             )
         );
-        $this->supported_formats = array('oai_dc');
 
         if (!is_array($this->METADATAFORMATS)) {
             exit("Configuration of METADATAFORMAT has been wrongly set. Correct your " . __FILE__);
         }
 
-        define('XMLSCHEMA', 'http://www.w3.org/2001/XMLSchema-instance');
         $this->charset = "iso8859-1";
         $this->xmlescaped = false;
     }
@@ -211,7 +207,7 @@ class OAIPMH_Expose {
      */
     function createResumToken($cursor, $from,$until,$sets, $metadataPrefix) {
         $token = $this->get_token();
-        $fp = fopen(TOKEN_PREFIX . $token, 'w');
+        $fp = fopen($this->token_prefix . $token, 'w');
         if ($fp == false) {
             exit("Cannot write. Writer permission needs to be changed.");
         }
diff --git a/src/oaipmh-expose/class-tainacan-oaipmh-get-record.php b/src/oaipmh-expose/class-tainacan-oaipmh-get-record.php
index 1f3328fd5..a68ef4217 100644
--- a/src/oaipmh-expose/class-tainacan-oaipmh-get-record.php
+++ b/src/oaipmh-expose/class-tainacan-oaipmh-get-record.php
@@ -182,10 +182,10 @@ class OAIPMH_Get_Record extends OAIPMH_Expose {
 
         if ( isset($data['resumptionToken']) ) {
 
-            if ( !file_exists(TOKEN_PREFIX . $data['resumptionToken']) ) {
+            if ( !file_exists($this->token_prefix . $data['resumptionToken']) ) {
                 $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
             } else {
-                $readings = $this->readResumToken(TOKEN_PREFIX . $data['resumptionToken']);
+                $readings = $this->readResumToken($this->token_prefix . $data['resumptionToken']);
                 if ($readings == false) {
                     $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
                 } else {
diff --git a/src/oaipmh-expose/class-tainacan-oaipmh-list-identifiers.php b/src/oaipmh-expose/class-tainacan-oaipmh-list-identifiers.php
index 586d7943f..280a3bc15 100644
--- a/src/oaipmh-expose/class-tainacan-oaipmh-list-identifiers.php
+++ b/src/oaipmh-expose/class-tainacan-oaipmh-list-identifiers.php
@@ -153,10 +153,10 @@ class OAIPMH_List_Identifiers extends OAIPMH_Expose {
 
         if ( isset($data['resumptionToken']) ) {
 
-            if ( !file_exists(TOKEN_PREFIX . $data['resumptionToken']) ) {
+            if ( !file_exists($this->token_prefix . $data['resumptionToken']) ) {
                 $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
             } else {
-                $readings = $this->readResumToken(TOKEN_PREFIX . $data['resumptionToken']);
+                $readings = $this->readResumToken($this->token_prefix . $data['resumptionToken']);
                 if ($readings == false) {
                     $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
                 } else {
@@ -212,7 +212,7 @@ class OAIPMH_List_Identifiers extends OAIPMH_Expose {
             }
             $this->cursor = (int) $this->deliveredrecords + $this->MAXRECORDS;
             $this->restoken = $this->createResumToken($this->cursor, $this->from,$this->until,$this->sets, $this->metadataPrefix);
-            $this->expirationdatetime = date("Y-m-d\TH:i:s\Z", time() * TOKEN_VALID);
+            $this->expirationdatetime = date("Y-m-d\TH:i:s\Z", time() * $this->token_valid);
         }
     }
 
diff --git a/src/oaipmh-expose/class-tainacan-oaipmh-list-records.php b/src/oaipmh-expose/class-tainacan-oaipmh-list-records.php
index a6b046590..c7a03c734 100644
--- a/src/oaipmh-expose/class-tainacan-oaipmh-list-records.php
+++ b/src/oaipmh-expose/class-tainacan-oaipmh-list-records.php
@@ -231,10 +231,10 @@ class OAIPMH_List_Records extends OAIPMH_Expose {
 
         if ( isset($data['resumptionToken']) ) {
 
-            if ( !file_exists(TOKEN_PREFIX . $data['resumptionToken']) ) {
+            if ( !file_exists($this->token_prefix . $data['resumptionToken']) ) {
                 $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
             } else {
-                $readings = $this->readResumToken(TOKEN_PREFIX . $data['resumptionToken']);
+                $readings = $this->readResumToken($this->token_prefix . $data['resumptionToken']);
                 if ($readings == false) {
                     $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
                 } else {
@@ -290,7 +290,7 @@ class OAIPMH_List_Records extends OAIPMH_Expose {
             }
             $this->cursor = (int) $this->deliveredrecords + $this->MAXRECORDS;
             $this->restoken = $this->createResumToken($this->cursor, $this->from,$this->until,$this->sets, $this->metadataPrefix);
-            $this->expirationdatetime = date("Y-m-d\TH:i:s\Z", time() * TOKEN_VALID);
+            $this->expirationdatetime = date("Y-m-d\TH:i:s\Z", time() * $this->token_valid);
         }
     }
 
diff --git a/src/oaipmh-expose/class-tainacan-oaipmh-list-sets.php b/src/oaipmh-expose/class-tainacan-oaipmh-list-sets.php
index 32fbe9077..894529942 100644
--- a/src/oaipmh-expose/class-tainacan-oaipmh-list-sets.php
+++ b/src/oaipmh-expose/class-tainacan-oaipmh-list-sets.php
@@ -122,10 +122,10 @@ class OAIPMH_List_Sets extends OAIPMH_Expose {
 
         if (isset($data['resumptionToken'])) {
 
-            if (!file_exists(TOKEN_PREFIX . $data['resumptionToken'])) {
+            if (!file_exists($this->token_prefix . $data['resumptionToken'])) {
                 $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
             } else {
-                $readings = $this->readResumToken(TOKEN_PREFIX . $data['resumptionToken']);
+                $readings = $this->readResumToken($this->token_prefix . $data['resumptionToken']);
                 if ($readings == false) {
                     $this->errors[] = $this->oai_error('badResumptionToken', '', $data['resumptionToken']);
                 } else {
@@ -158,9 +158,7 @@ class OAIPMH_List_Sets extends OAIPMH_Expose {
             }
             $this->cursor = (int) $this->deliveredrecords + $this->MAXRECORDS;
             $this->restoken = $this->createResumToken($this->cursor, $this->from,$this->until,$this->sets, $this->metadataPrefix);
-            // var_dump(time() + TOKEN_VALID,date("Y-m-d\TH:i:s\Z", time() + TOKEN_VALID));
-            $this->expirationdatetime = date("Y-m-d\TH:i:s\Z", time() + TOKEN_VALID);
-            //$this->expirationdatetime = gmstrftime('%Y-%m-%d\T%T\Z', time() + TOKEN_VALID);
+            $this->expirationdatetime = date("Y-m-d\TH:i:s\Z", time() + $this->token_valid);
         }
     }
 
diff --git a/src/oaipmh-expose/class-tainacan-xml-create.php b/src/oaipmh-expose/class-tainacan-xml-create.php
index ad9520aeb..47692d56b 100644
--- a/src/oaipmh-expose/class-tainacan-xml-create.php
+++ b/src/oaipmh-expose/class-tainacan-xml-create.php
@@ -94,7 +94,7 @@ class Xml_Create {
      * Keys of the array define attributes, and values are their content.
      */
     function create_request($par_array) {
-        $request = $this->addChild($this->doc->documentElement, "request", MY_URI);
+        $request = $this->addChild($this->doc->documentElement, "request", TAINACAN_OAI_REPOSITORY_URL);
         foreach ($par_array as $key => $value) {
             $request->setAttribute($key, $value);
         }