diff --git a/README.md b/README.md
index 64278b8..38dc54b 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Versioned drivers to create and read KVAZAR index in different applications
 
 ## Install
 
-* `apt install composer manticore php-fpm php-pdo php-xml`
+* `apt install composer manticore php-fpm php-pdo`
 * `composer require kvazar/index:dev-main`
 
 ## Usage
diff --git a/src/Manticore.php b/src/Manticore.php
index 3f951a8..6880f44 100644
--- a/src/Manticore.php
+++ b/src/Manticore.php
@@ -336,16 +336,16 @@ class Manticore
             case is_object($value):
                 return self::TYPE_OBJECT;
 
-            case is_string($value) && false === mb_detect_encoding((string) $value, null, true):
+            case is_string($value) && false === mb_detect_encoding($value, null, true):
                 return self::TYPE_BIN;
 
-            case is_string($value) && false === preg_match('/\s/', $value) && base64_encode((string) base64_decode((string) $value, true)) === $value:
+            case is_string($value) && false === preg_match('/\s/', $value) && base64_encode((string) base64_decode($value, true)) === $value:
                 return self::TYPE_BASE_64;
 
-            case is_string($value) && json_encode((string) json_decode((string) $value)) === $value:
+            case is_string($value) && json_encode(json_decode($value)) === $value:
                 return self::TYPE_JSON;
 
-            case is_string($value) && false !== @simplexml_load_string((string) $value):
+            case is_string($value) && false !== preg_match('/<\/[^>]+>/', $value):
                 return self::TYPE_XML;
 
             default: