diff --git a/conf/parser/mtas/chat_test.xml b/conf/parser/mtas/chat_test.xml
index 79fbfa4..b537397 100644
--- a/conf/parser/mtas/chat_test.xml
+++ b/conf/parser/mtas/chat_test.xml
@@ -103,6 +103,15 @@
 						<item type="text" />
 					</post>
 				</token>
+				<token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value="_lc" />
+          </pre>
+          <post>
+            <item type="text" filter="ascii,lowercase" />
+          </post>
+        </token>
 			</mapping>
 			<mapping type="word" name="t">
 				<token type="string" offset="false">
diff --git a/docker/mtas/demo_chat.xml b/docker/mtas/demo_chat.xml
index 79fbfa4..2a8fe62 100644
--- a/docker/mtas/demo_chat.xml
+++ b/docker/mtas/demo_chat.xml
@@ -1,129 +1,138 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <mtas>
 
-	<!-- START MTAS INDEX CONFIGURATION -->
-	<index>
-		<!-- START GENERAL SETTINGS MTAS INDEX PROCESS -->
-		<payload index="true" />
-		<offset index="true" />
-		<realoffset index="true" />
-		<parent index="true" />
-		<!-- END GENERAL SETTINGS MTAS INDEX PROCESS -->
-	</index>
-	<!-- END MTAS INDEX CONFIGURATION -->
+  <!-- START MTAS INDEX CONFIGURATION -->
+  <index>
+    <!-- START GENERAL SETTINGS MTAS INDEX PROCESS -->
+    <payload index="true" />
+    <offset index="true" />
+    <realoffset index="true" />
+    <parent index="true" />
+    <!-- END GENERAL SETTINGS MTAS INDEX PROCESS -->
+  </index>
+  <!-- END MTAS INDEX CONFIGURATION -->
 
 
 
-	<!-- START CONFIGURATION MTAS CHAT PARSER -->
-	<parser name="mtas.analysis.parser.MtasChatParser">
+  <!-- START CONFIGURATION MTAS CHAT PARSER -->
+  <parser name="mtas.analysis.parser.MtasChatParser">
 
-		<!-- START GENERAL SETTINGS MTAS CHAT PARSER -->
-		<autorepair value="true" />
-		<makeunique value="true" />
-		<!-- END GENERAL SETTINGS MTAS CHAT PARSER -->
+    <!-- START GENERAL SETTINGS MTAS CHAT PARSER -->
+    <autorepair value="true" />
+    <makeunique value="true" />
+    <!-- END GENERAL SETTINGS MTAS CHAT PARSER -->
 
-		<!-- START VARIABLES -->
-		<variables>
-			<variable name="participant" value="participant.role">
-				<value>
-					<item type="attribute" name="role" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.name">
-				<value>
-					<item type="attribute" name="name" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.age">
-				<value>
-					<item type="attribute" name="age" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.group">
-				<value>
-					<item type="attribute" name="group" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.sex">
-				<value>
-					<item type="attribute" name="sex" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.SES">
-				<value>
-					<item type="attribute" name="SES" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.education">
-				<value>
-					<item type="attribute" name="education" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.custom-field">
-				<value>
-					<item type="attribute" name="custom-field" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.birthday">
-				<value>
-					<item type="attribute" name="birthday" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.language">
-				<value>
-					<item type="attribute" name="language" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.first-language">
-				<value>
-					<item type="attribute" name="first-language" />
-				</value>
-			</variable>
-			<variable name="participant" value="participant.birthplace">
-				<value>
-					<item type="attribute" name="birthplace" />
-				</value>
-			</variable>
-		</variables>
-		<!-- END VARIABLES -->
+    <!-- START VARIABLES -->
+    <variables>
+      <variable name="participant" value="participant.role">
+        <value>
+          <item type="attribute" name="role" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.name">
+        <value>
+          <item type="attribute" name="name" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.age">
+        <value>
+          <item type="attribute" name="age" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.group">
+        <value>
+          <item type="attribute" name="group" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.sex">
+        <value>
+          <item type="attribute" name="sex" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.SES">
+        <value>
+          <item type="attribute" name="SES" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.education">
+        <value>
+          <item type="attribute" name="education" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.custom-field">
+        <value>
+          <item type="attribute" name="custom-field" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.birthday">
+        <value>
+          <item type="attribute" name="birthday" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.language">
+        <value>
+          <item type="attribute" name="language" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.first-language">
+        <value>
+          <item type="attribute" name="first-language" />
+        </value>
+      </variable>
+      <variable name="participant" value="participant.birthplace">
+        <value>
+          <item type="attribute" name="birthplace" />
+        </value>
+      </variable>
+    </variables>
+    <!-- END VARIABLES -->
 
-		<!-- START REFERENCES -->
-		<!-- END REFERENCES -->
+    <!-- START REFERENCES -->
+    <!-- END REFERENCES -->
 
-		<!-- START MAPPINGS -->
-		<mappings>
+    <!-- START MAPPINGS -->
+    <mappings>
 
-			<!-- START WORDS -->
-			<mapping type="word" name="w">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-					</pre>
-					<post>
-						<item type="text" />
-					</post>
-				</token>
-			</mapping>
-			<mapping type="word" name="t">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="attribute" name="type" prefix="." />
-					</pre>
-				</token>
-			</mapping>
-			<mapping type="word" name="a">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="attribute" name="type" prefix="." />
-					</pre>
-					<post>
-						<item type="text" />
-					</post>
-				</token>
-			</mapping>
-			<mapping type="word" name="e">
+      <!-- START WORDS -->
+      <mapping type="word" name="w">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+          </pre>
+          <post>
+            <item type="text" />
+          </post>
+        </token>
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value="_lc" />
+          </pre>
+          <post>
+            <item type="text" filter="ascii,lowercase" />
+          </post>
+        </token>
+      </mapping>
+      <mapping type="word" name="t">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="attribute" name="type" prefix="." />
+          </pre>
+        </token>
+      </mapping>
+      <mapping type="word" name="a">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="attribute" name="type" prefix="." />
+          </pre>
+          <post>
+            <item type="text" />
+          </post>
+        </token>
+      </mapping>
+      <mapping type="word" name="e">
         <token type="string" offset="false">
           <pre>
             <item type="name" />
@@ -143,69 +152,69 @@
           </post>
         </token>
       </mapping>
-			<!-- END WORDS -->
+      <!-- END WORDS -->
 
-			<!-- START WORD ANNOTATIONS -->			
-			<mapping type="wordAnnotation" name="pos">
-			</mapping>
-			<mapping type="wordAnnotation" name="c">
-				<token type="string" offset="false">
-					<pre>
-						<item type="ancestorName" />
-						<item type="name" prefix="." />
-					</pre>
-					<post>
-						<item type="text" />
-					</post>
-				</token>
-				<condition>
-					<item type="ancestorName" condition="pos" />
-					<item type="ancestorWordName" condition="w" />
-				</condition>
-			</mapping>
-			<mapping type="wordAnnotation" name="s">
-				<token type="string" offset="false">
-					<pre>
-						<item type="ancestorName" />
-						<item type="name" prefix="." />
-					</pre>
-					<post>
-						<item type="text" />
-					</post>
-				</token>
-				<condition>
-					<item type="ancestorName" condition="pos" />
-					<item type="ancestorWordName" condition="w" />
-				</condition>
-			</mapping>
-			<mapping type="wordAnnotation" name="stem">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-					</pre>
-					<post>
-						<item type="text" />
-					</post>
-				</token>
-				<condition>
+      <!-- START WORD ANNOTATIONS -->     
+      <mapping type="wordAnnotation" name="pos">
+      </mapping>
+      <mapping type="wordAnnotation" name="c">
+        <token type="string" offset="false">
+          <pre>
+            <item type="ancestorName" />
+            <item type="name" prefix="." />
+          </pre>
+          <post>
+            <item type="text" />
+          </post>
+        </token>
+        <condition>
+          <item type="ancestorName" condition="pos" />
+          <item type="ancestorWordName" condition="w" />
+        </condition>
+      </mapping>
+      <mapping type="wordAnnotation" name="s">
+        <token type="string" offset="false">
+          <pre>
+            <item type="ancestorName" />
+            <item type="name" prefix="." />
+          </pre>
+          <post>
+            <item type="text" />
+          </post>
+        </token>
+        <condition>
+          <item type="ancestorName" condition="pos" />
+          <item type="ancestorWordName" condition="w" />
+        </condition>
+      </mapping>
+      <mapping type="wordAnnotation" name="stem">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+          </pre>
+          <post>
+            <item type="text" />
+          </post>
+        </token>
+        <condition>
           <item type="ancestorWordName" condition="w" />
         </condition>
-			</mapping>
-			<mapping type="wordAnnotation" name="mk">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="attribute" name="type" prefix="." />
-					</pre>
-					<post>
-						<item type="text" />
-					</post>
-				</token>
-				<condition>
+      </mapping>
+      <mapping type="wordAnnotation" name="mk">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="attribute" name="type" prefix="." />
+          </pre>
+          <post>
+            <item type="text" />
+          </post>
+        </token>
+        <condition>
           <item type="ancestorWordName" condition="w" />
         </condition>
-			</mapping>
-			<mapping type="wordAnnotation" name="ga">
+      </mapping>
+      <mapping type="wordAnnotation" name="ga">
         <token type="string" offset="false">
           <pre>
             <item type="ancestorWordName" />
@@ -231,194 +240,194 @@
           <item type="ancestorWordName" condition="e" />
         </condition>
       </mapping>
-			<!-- END WORD ANNOTATIONS -->
+      <!-- END WORD ANNOTATIONS -->
 
-			<!-- START RELATIONS -->
-			<!-- END RELATIONS -->
+      <!-- START RELATIONS -->
+      <!-- END RELATIONS -->
 
-			<!-- START GROUPS -->
-			<mapping type="group" name="tcu">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-					</pre>
-				</token>
-			</mapping>
-			<mapping type="group" name="u">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-					</pre>
-				</token>
-			</mapping>
-			<mapping type="group" name="u">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".id" />
-					</pre>
-					<post>
-						<item type="attribute" name="uID" />
-					</post>
-				</token>
-				<condition>
-					<item type="attribute" name="uID" />
-				</condition>
-			</mapping>
-			<mapping type="group" name="u">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".role" />
-					</pre>
-					<post>
-						<item type="variableFromAttribute" name="participant.role"
-							value="who" />
-					</post>
-				</token>
-			</mapping>
-			<mapping type="group" name="u">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".name" />
-					</pre>
-					<post>
-						<item type="variableFromAttribute" name="participant.name"
-							value="who" />
-					</post>
-				</token>
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".age" />
-					</pre>
-					<post>
-						<item type="variableFromAttribute" name="participant.age"
-							value="who" />
-					</post>
-				</token>
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".sex" />
-					</pre>
-					<post>
-						<item type="variableFromAttribute" name="participant.sex"
-							value="who" />
-					</post>
-				</token>
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".birthday" />
-					</pre>
-					<post>
-						<item type="variableFromAttribute" name="participant.birthday"
-							value="who" />
-					</post>
-				</token>
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".language" />
-					</pre>
-					<post>
-						<item type="variableFromAttribute" name="participant.language"
-							value="who" />
-					</post>
-				</token>
-				<condition>
-					<item type="attribute" name="who" />
-				</condition>
-			</mapping>
-			<mapping type="group" name="g">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-					</pre>
-				</token>
-			</mapping>
-			<mapping type="group" name="pg">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-					</pre>
-				</token>
-			</mapping>
-			<mapping type="group" name="sg">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-					</pre>
-				</token>
-			</mapping>
-			<!-- END GROUPS -->
+      <!-- START GROUPS -->
+      <mapping type="group" name="tcu">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+          </pre>
+        </token>
+      </mapping>
+      <mapping type="group" name="u">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+          </pre>
+        </token>
+      </mapping>
+      <mapping type="group" name="u">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".id" />
+          </pre>
+          <post>
+            <item type="attribute" name="uID" />
+          </post>
+        </token>
+        <condition>
+          <item type="attribute" name="uID" />
+        </condition>
+      </mapping>
+      <mapping type="group" name="u">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".role" />
+          </pre>
+          <post>
+            <item type="variableFromAttribute" name="participant.role"
+              value="who" />
+          </post>
+        </token>
+      </mapping>
+      <mapping type="group" name="u">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".name" />
+          </pre>
+          <post>
+            <item type="variableFromAttribute" name="participant.name"
+              value="who" />
+          </post>
+        </token>
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".age" />
+          </pre>
+          <post>
+            <item type="variableFromAttribute" name="participant.age"
+              value="who" />
+          </post>
+        </token>
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".sex" />
+          </pre>
+          <post>
+            <item type="variableFromAttribute" name="participant.sex"
+              value="who" />
+          </post>
+        </token>
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".birthday" />
+          </pre>
+          <post>
+            <item type="variableFromAttribute" name="participant.birthday"
+              value="who" />
+          </post>
+        </token>
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".language" />
+          </pre>
+          <post>
+            <item type="variableFromAttribute" name="participant.language"
+              value="who" />
+          </post>
+        </token>
+        <condition>
+          <item type="attribute" name="who" />
+        </condition>
+      </mapping>
+      <mapping type="group" name="g">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+          </pre>
+        </token>
+      </mapping>
+      <mapping type="group" name="pg">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+          </pre>
+        </token>
+      </mapping>
+      <mapping type="group" name="sg">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+          </pre>
+        </token>
+      </mapping>
+      <!-- END GROUPS -->
 
-			<!-- START GROUP ANNOTATIONS -->
-			<mapping type="groupAnnotation" name="a">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="attribute" name="type" prefix="." />
-						<item type="attribute" name="flavor" prefix="." />
-					</pre>
-					<post>
-						<item type="text" />
-					</post>
-				</token>
-				<condition>
-					<item type="attribute" name="type" />
-				</condition>
-			</mapping>
-			<mapping type="groupAnnotation" name="media">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".start" />
-					</pre>
-					<post>
-						<item type="attribute" name="start" />
-					</post>
-				</token>
-				<condition>
-					<item type="attribute" name="start" />
-				</condition>
-			</mapping>
-			<mapping type="groupAnnotation" name="media">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".end" />
-					</pre>
-					<post>
-						<item type="attribute" name="end" />
-					</post>
-				</token>
-				<condition>
-					<item type="attribute" name="end" />
-				</condition>
-			</mapping>
-			<mapping type="groupAnnotation" name="media">
-				<token type="string" offset="false">
-					<pre>
-						<item type="name" />
-						<item type="string" value=".unit" />
-					</pre>
-					<post>
-						<item type="attribute" name="unit" />
-					</post>
-				</token>
-				<condition>
-					<item type="attribute" name="unit" />
-				</condition>
-			</mapping>
-			<!-- END GROUP ANNOTATIONS -->
+      <!-- START GROUP ANNOTATIONS -->
+      <mapping type="groupAnnotation" name="a">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="attribute" name="type" prefix="." />
+            <item type="attribute" name="flavor" prefix="." />
+          </pre>
+          <post>
+            <item type="text" />
+          </post>
+        </token>
+        <condition>
+          <item type="attribute" name="type" />
+        </condition>
+      </mapping>
+      <mapping type="groupAnnotation" name="media">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".start" />
+          </pre>
+          <post>
+            <item type="attribute" name="start" />
+          </post>
+        </token>
+        <condition>
+          <item type="attribute" name="start" />
+        </condition>
+      </mapping>
+      <mapping type="groupAnnotation" name="media">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".end" />
+          </pre>
+          <post>
+            <item type="attribute" name="end" />
+          </post>
+        </token>
+        <condition>
+          <item type="attribute" name="end" />
+        </condition>
+      </mapping>
+      <mapping type="groupAnnotation" name="media">
+        <token type="string" offset="false">
+          <pre>
+            <item type="name" />
+            <item type="string" value=".unit" />
+          </pre>
+          <post>
+            <item type="attribute" name="unit" />
+          </post>
+        </token>
+        <condition>
+          <item type="attribute" name="unit" />
+        </condition>
+      </mapping>
+      <!-- END GROUP ANNOTATIONS -->
 
-		</mappings>
-		<!-- END MAPPINGS -->
+    </mappings>
+    <!-- END MAPPINGS -->
 
-	</parser>
-	<!-- END CONFIGURATION MTAS CHAT PARSER -->
+  </parser>
+  <!-- END CONFIGURATION MTAS CHAT PARSER -->
 
 </mtas>
\ No newline at end of file