diff --git a/src/Entry.php b/src/Entry.php
index ab91ab3..8e71c09 100644
--- a/src/Entry.php
+++ b/src/Entry.php
@@ -60,7 +60,7 @@ class Entry {
       case 'changes':
         return $this -> changes;
       default:
-        return $this -> get_values($key);
+        return $this -> get_value($key);
     }
   }
 
@@ -78,14 +78,7 @@ class Entry {
         else
           $this -> error('Unexcepted DN value provided: must be a string or false');
       default:
-        $key = mb_strtolower($key);
-        if (is_null($value))
-          $value = array();
-        if (!is_array($value))
-          $value = array($value);
-        $this -> changes[$key] = array();
-        foreach($value as $v)
-          $this -> changes[$key][] = strval($v);
+        $this -> set_value($key, $value);
     }
   }
 
@@ -103,7 +96,7 @@ class Entry {
   }
 
   /**
-   * Get an attribute values
+   * Get raw attribute values
    * @param string $attr The expected attribute name
    * @param mixed $default The default value if attribute is not set
    *                       (optional, default: null or array() if $all_values is True)
@@ -111,7 +104,7 @@ class Entry {
    *                         first one (optional, default: true)
    * @return ( $all_values is True ? array<string> : mixed )
    */
-  public function get_values($attr, $default=null, $all_values=true) {
+  public function get_raw_values($attr, $default=null, $all_values=true) {
     $attr = mb_strtolower($attr);
     $values = false;
     if (array_key_exists($attr, $this -> changes))
@@ -123,6 +116,71 @@ class Entry {
     return $all_values?$values:$values[0];
   }
 
+  /**
+   * Get an attribute value (using LDAP schema if used and a LDAP link is registered on entry)
+   * @param string $attr The expected attribute name
+   * @param mixed $default The default value if attribute is not set
+   *                       (optional, default: null or array() if $all_values is True)
+   * @param bool $first If True, return only the first attribute values, otherwise return
+   *                    depending on the fact is single valued or not in LDAP schema (optional,
+   *                    default: false)
+   * @return mixed
+   */
+  public function get_value($attr, $default=null, $first=false) {
+    if (!$this -> ldap || !$this -> ldap -> schema)
+      return $this -> get_raw_values($attr, $default, $first?false:true);
+    $attr = mb_strtolower($attr);
+    $values = false;
+    if (array_key_exists($attr, $this -> changes))
+      $values = &$this -> changes[$attr];
+    elseif (array_key_exists($attr, $this -> data))
+      $values = &$this -> data[$attr];
+    $attribute = $this -> ldap -> schema -> attribute($attr);
+    if (!$attribute)
+      return $this -> error('Unkown attribute %s in schema', null, $attr);
+    if (!$values) {
+      if (is_null($default) && !$first && !$attribute->single)
+        return array();
+      return $default;
+    }
+    return $attribute -> ldap2php($values);
+  }
+
+  /**
+   * Set raw LDAP attribute values
+   * @param string $attr
+   * @param mixed $values
+   * @return void
+   */
+  public function set_raw_values($attr, $values) {
+    $attr = mb_strtolower($attr);
+    if (is_null($values))
+      $values = array();
+    else if (!is_array($values))
+      $values = array($values);
+    $this -> changes[$attr] = array();
+    foreach($values as $value)
+      $this -> changes[$attr][] = strval($value);
+  }
+
+  /**
+   * Set LDAP attribute values
+   * @param string $attr
+   * @param mixed $value
+   * @return void|false
+   */
+  public function set_value($attr, $value) {
+    if (!$this -> ldap || !$this -> ldap -> schema) {
+      $this -> set_raw_values($attr, $value);
+      return;
+    }
+    $attribute = $this -> ldap -> schema -> attribute($attr);
+    if (!$attribute)
+      return $this -> error('Unkown attribute %s in schema', null, $attr);
+    $values = $attribute -> php2ldap($value);
+    $this -> set_raw_values($attr, $values);
+  }
+
   /**
    * Log and eventually raise an error
    * @param string $error The error message
diff --git a/src/Ldap.php b/src/Ldap.php
index f6e773c..bab3436 100644
--- a/src/Ldap.php
+++ b/src/Ldap.php
@@ -21,6 +21,7 @@ namespace EesyLDAP;
  * @property-read string $scope
  * @property-read bool $raise_on_error
  * @property-read bool $use_schema
+ * @property-read Schema|false $schema
  */
 class Ldap {
 
@@ -391,12 +392,11 @@ class Ldap {
       case 'default_config':
         return self :: $default_config;
       case 'schema':
-        if ($this->schema)
-          return $this->schema;
         if (!$this->use_schema)
           return false;
-        $this->schema = Schema :: load($this);
-        return $this->schema;
+        if (!$this->schema)
+          $this->schema = Schema :: load($this);
+        return $this->schema && $this->schema->loaded?$this->schema:false;
     }
     return $this -> error("Invalid property '$key' requested");
   }
@@ -506,7 +506,7 @@ class Ldap {
           $attrs[$attr][$k] = $result[$i][$attr][$k];
       }
       // @phpstan-ignore-next-line
-      $entries[$dn] = new Entry($dn, $attrs);
+      $entries[$dn] = new Entry($dn, $attrs, $this);
     }
     // @phpstan-ignore-next-line
     return $entries;
diff --git a/src/Schema.php b/src/Schema.php
index f5eefb4..c156e46 100644
--- a/src/Schema.php
+++ b/src/Schema.php
@@ -2,6 +2,9 @@
 namespace EesyLDAP;
 
 
+/**
+ * @property-read bool $loaded
+ */
 class Schema {
 
   /**
@@ -53,6 +56,12 @@ class Schema {
    */
   protected $oids = array();
 
+  /**
+   * Loaded telltale
+   * @var bool
+   */
+  protected $loaded = false;
+
   /**
    * Constructor
    * @param Ldap $ldap The LDAP connection
@@ -63,6 +72,23 @@ class Schema {
     $this -> ldap = $ldap;
     $this -> entry = $entry;
     $this -> parse();
+    $this -> loaded = true;
+  }
+
+  /**
+   * Magic method to get schema key
+   * @param string $key
+   * @return mixed
+   * @throws \EesyLDAP\InvalidPropertyException
+   */
+  public function __get($key) {
+    switch ($key) {
+      case 'loaded':
+        return $this -> loaded;
+    }
+    throw new \EesyLDAP\InvalidPropertyException(
+      "Invalid property '$key' requested on '".get_called_class()."'"
+    );
   }
 
   /**
@@ -88,7 +114,7 @@ class Schema {
   protected function parse() {
     foreach (self :: $attributes_to_entry_types as $attr => $type) {
       $type_name = strtolower($type);
-      foreach($this -> entry -> get_values($attr, array(), true) as $value) {
+      foreach($this -> entry -> get_raw_values($attr, array(), true) as $value) {
         // @phpstan-ignore-next-line
         $entry = call_user_func("\\EesyLDAP\\Schema\\$type::parse", $value);
         if (!$entry instanceof Schema\SchemaEntry) {
diff --git a/src/Schema/Attribute.php b/src/Schema/Attribute.php
index f3a24b2..563de7c 100644
--- a/src/Schema/Attribute.php
+++ b/src/Schema/Attribute.php
@@ -2,6 +2,7 @@
 
 namespace EesyLDAP\Schema;
 
+use EesyLDAP\Schema;
 
 /**
  * @property-read string $oid
@@ -69,6 +70,32 @@ class Attribute extends SchemaEntry {
     'multiple',
   );
 
+  /**
+   * Map attribute syntax OID to corresponding sub Attribute types
+   * @var array<string,class-string<Attribute>>
+   */
+  protected static $map_syntax_to_subtypes = array(
+    Schema::SYNTAX_BOOLEAN => Attribute\BooleanAttribute::class,
+  );
+
+  /**
+   * Parse a SubSchema attribute value into a SchemaEntry object
+   * @param string $value Attribute value
+   * @return Attribute
+   */
+  public static function parse($value) {
+    $schema_entry = self :: _parse($value);
+    if (
+      isset($schema_entry['syntax'])
+      && is_string($schema_entry['syntax'])
+      && array_key_exists($schema_entry['syntax'], self :: $map_syntax_to_subtypes)
+    )
+      $type = self :: $map_syntax_to_subtypes[$schema_entry['syntax']];
+    else
+      $type = self :: class;
+    return new $type($schema_entry);
+  }
+
   /**
    * Magic method to get attribute schema entry key
    * @param string $key
@@ -82,4 +109,31 @@ class Attribute extends SchemaEntry {
     }
     return parent::__get($key);
   }
+
+  /**
+   * Convert LDAP value to PHP value
+   * @param array<int,string> $value
+   * @return string|array<string>|null
+   */
+  public function ldap2php($value) {
+    if ($value)
+      return $this->single?$value[0]:$value;
+    return $this->single?null:array();
+  }
+
+  /**
+   * Convert LDAP value to PHP value
+   * @param mixed $value
+   * @return array<int,string>
+   */
+  public function php2ldap($value) {
+    if (is_null($value))
+      return array();
+    if (!is_array($value))
+      $value = array($value);
+    $ldap_value = array();
+    foreach($value as $v)
+      $ldap_value[] = strval($v);
+    return $ldap_value;
+  }
 }
diff --git a/src/Schema/Attribute/BooleanAttribute.php b/src/Schema/Attribute/BooleanAttribute.php
new file mode 100644
index 0000000..9b9f3fc
--- /dev/null
+++ b/src/Schema/Attribute/BooleanAttribute.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace EesyLDAP\Schema\Attribute;
+
+/**
+ * LDAP Schema boolean attribute
+ */
+class BooleanAttribute extends \EesyLDAP\Schema\Attribute {
+
+  /**
+   * LDAP stored value for true
+   * @var string
+   */
+  const TRUE_VALUE = 'TRUE';
+
+  /**
+   * LDAP stored value for false
+   * @var string
+   */
+  const FALSE_VALUE = 'FALSE';
+
+
+
+  /**
+   * Convert one LDAP value to PHP value
+   * @param string $value
+   * @return bool|null
+   */
+  protected function _ldap2php($value) {
+    if ($value == self :: TRUE_VALUE)
+      return true;
+    if ($value == self :: FALSE_VALUE)
+      return false;
+    return null;
+  }
+  /**
+   * Convert LDAP value to PHP value
+   * @param array<int,string> $value
+   * @return bool|null|array<bool|null>
+   */
+  public function ldap2php($value) {
+    $value = parent::ldap2php($value);
+    if (is_string($value))
+      return self :: _ldap2php($value);
+    if (is_array($value)) {
+      $php_value = array();
+      foreach($value as $v)
+        $php_value[] = self :: _ldap2php($v);
+      return $php_value;
+    }
+    return $this->single?null:array();
+  }
+
+  /**
+   * Convert LDAP value to PHP value
+   * @param mixed $value
+   * @return array<int,string>
+   */
+  public function php2ldap($value) {
+    if (is_null($value))
+      return array();
+    $value = is_array($value)?$value:array($value);
+    $ldap_value = array();
+    foreach(parent::php2ldap($value) as $value)
+      $ldap_value[] = $value?self :: TRUE_VALUE:self :: FALSE_VALUE;
+    return $ldap_value;
+  }
+}
diff --git a/src/Schema/SchemaEntry.php b/src/Schema/SchemaEntry.php
index d483b87..d72e009 100644
--- a/src/Schema/SchemaEntry.php
+++ b/src/Schema/SchemaEntry.php
@@ -50,17 +50,15 @@ class SchemaEntry {
   }
 
   /**
-   * Parses an SubSchema attribute value into a SchemaEntry object
+   * Parse an SubSchema attribute value into a hash of entry properties
    *
    * Note: mainly from PEAR Net_LDAP2_Schema::_parse_entry()
    * @link https://pear.php.net/package/Net_LDAP2
    *
    * @param string $value Attribute value
-   *
-   * @access protected
-   * @return SchemaEntry
+   * @return array<string,mixed>
    */
-  public static function parse($value) {
+  public static function _parse($value) {
     // tokens that have no value associated
     $noValue = array(
       'single-value',
@@ -116,6 +114,16 @@ class SchemaEntry {
         $schema_entry['max_length'] = intval($matches[1]);
       }
     }
+    return $schema_entry;
+  }
+
+  /**
+   * Parse a SubSchema attribute value into a SchemaEntry object
+   * @param string $value Attribute value
+   * @return SchemaEntry|false
+   */
+  public static function parse($value) {
+    $schema_entry = self :: _parse($value);
     $type = get_called_class();
     return new $type($schema_entry);
   }