diff --git a/docs/checkstyle_checks.xml b/docs/checkstyle_checks.xml
index ca74c3c7d..c5b46e3d4 100644
--- a/docs/checkstyle_checks.xml
+++ b/docs/checkstyle_checks.xml
@@ -1,4 +1,5 @@
 <?xml version="1.0"?>
+<!DOCTYPE configuration SYSTEM "configuration.dtd">
 
 <configuration>
 
@@ -40,22 +41,23 @@
     <check classname="com.puppycrawl.tools.checkstyle.checks.NoWhitespaceAfterCheck"/>
     <check classname="com.puppycrawl.tools.checkstyle.checks.NoWhitespaceBeforeCheck"/>
 
-<!-- Dot operator -->
- <check classname="com.puppycrawl.tools.checkstyle.checks.NoWhitespaceAfterCheck">
-     <tokens>
+    <!-- Dot operator -->
+    <check classname="com.puppycrawl.tools.checkstyle.checks.NoWhitespaceAfterCheck">
+        <tokens>
            DOT
-      </tokens>
-      <set-property name="allowLineBreaks" value="true"/>
-  </check>
- <check classname="com.puppycrawl.tools.checkstyle.checks.NoWhitespaceBeforeCheck">
-     <tokens>
+        </tokens>
+        <set-property name="allowLineBreaks" value="true"/>
+    </check>
+    <check classname="com.puppycrawl.tools.checkstyle.checks.NoWhitespaceBeforeCheck">
+        <tokens>
            DOT
-      </tokens>
-      <set-property name="allowLineBreaks" value="true"/>
- </check>
+        </tokens>
+        <set-property name="allowLineBreaks" value="true"/>
+    </check>
 
  
 
+
     <check classname="com.puppycrawl.tools.checkstyle.checks.OperatorWrapCheck"/>
     <check classname="com.puppycrawl.tools.checkstyle.checks.OperatorWrapCheck">
         <tokens>
diff --git a/docs/configuration.dtd b/docs/configuration.dtd
new file mode 100644
index 000000000..d7c2aa565
--- /dev/null
+++ b/docs/configuration.dtd
@@ -0,0 +1,12 @@
+<!--
+ DTD for a checkstyle configuration.
+ -->
+<!ELEMENT configuration (check*)>
+<!ELEMENT check (tokens?, set-property?)>
+<!ELEMENT tokens (#PCDATA)>
+<!ELEMENT set-property EMPTY>
+
+<!ATTLIST check classname CDATA #REQUIRED>
+<!ATTLIST set-property name CDATA #REQUIRED
+                       value CDATA #REQUIRED
+>
\ No newline at end of file