diff --git a/.idea/checkstyle-idea.xml b/.idea/checkstyle-idea.xml
new file mode 100644
index 0000000..f5b372c
--- /dev/null
+++ b/.idea/checkstyle-idea.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CheckStyle-IDEA" serialisationVersion="2">
+    <checkstyleVersion>10.12.5</checkstyleVersion>
+    <scanScope>JavaOnly</scanScope>
+    <copyLibs>true</copyLibs>
+    <option name="thirdPartyClasspath" />
+    <option name="activeLocationIds" />
+    <option name="locations">
+      <list>
+        <ConfigurationLocation id="bundled-sun-checks" type="BUNDLED" scope="All" description="Sun Checks">(bundled)</ConfigurationLocation>
+        <ConfigurationLocation id="bundled-google-checks" type="BUNDLED" scope="All" description="Google Checks">(bundled)</ConfigurationLocation>
+      </list>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 485de99..1a4e48d 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -8,6 +8,7 @@
         <outputRelativeToContentRoot value="true" />
         <module name="rets-io-client (1)" />
         <module name="rets-io-common" />
+        <module name="rets-io-validation" />
         <module name="rets-io-client" />
       </profile>
     </annotationProcessing>
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
index cbddad9..f758a22 100644
--- a/.idea/encodings.xml
+++ b/.idea/encodings.xml
@@ -7,5 +7,7 @@
     <file url="file://$PROJECT_DIR$/common/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/validation/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/validation/src/main/resources" charset="UTF-8" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index 35eb1dd..ce03a1e 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -2,5 +2,6 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/validation" vcs="Git" />
   </component>
 </project>
\ No newline at end of file
diff --git a/client/src/test/java/com/ossez/usreio/tests/common/util/CaseInsensitiveTreeMapTest.java b/client/src/test/java/com/ossez/usreio/tests/common/util/CaseInsensitiveTreeMapTest.java
index 17b8d0b..c26ed00 100644
--- a/client/src/test/java/com/ossez/usreio/tests/common/util/CaseInsensitiveTreeMapTest.java
+++ b/client/src/test/java/com/ossez/usreio/tests/common/util/CaseInsensitiveTreeMapTest.java
@@ -1,54 +1,64 @@
 package com.ossez.usreio.tests.common.util;
 
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import com.ossez.usreio.common.util.CaseInsensitiveTreeMap;
 import junit.framework.TestCase;
+import org.apache.commons.lang3.StringUtils;
 
 public class CaseInsensitiveTreeMapTest extends TestCase {
 
-	private CaseInsensitiveTreeMap map;
+    private CaseInsensitiveTreeMap map;
 
-	@Override
-	protected void setUp() throws Exception {
-		super.setUp();
-		this.map = new CaseInsensitiveTreeMap();
-	}
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        this.map = new CaseInsensitiveTreeMap();
+    }
 
-	@Override
-	protected void tearDown() throws Exception {
-		super.tearDown();
-		this.map = null;
-	}
+    @Override
+    protected void tearDown() throws Exception {
+        super.tearDown();
+        this.map = null;
+    }
 
-	public void testGetPut() throws Exception {
-		this.map.put("A", "X");
-		assertEquals("X", this.map.get("A"));
-		assertEquals("X", this.map.get("a"));
+    public void testGetPut() throws Exception {
 
-		this.map.put("a", "Y");
-		assertEquals("Y", this.map.get("a"));
-		assertEquals("Y", this.map.get("A"));
+        List<Integer> numbers = List.of(1, 2, 3, 4, 5, 6, 7);
+        List<Integer> result = new ArrayList<Integer>();
+        for (int i = numbers.size() - 1; i >= 0; i--) {
+            result.add(numbers.get(i));
 
-		assertEquals(1, this.map.size());
-	}
 
-	public void testContainsKey() throws Exception {
-		this.map.put("A", "X");
-		assertTrue(this.map.containsKey("A"));
-		assertTrue(this.map.containsKey("a"));
-	}
+        }
+        System.out.println(result);
+    }
 
-	public void testClone() throws Exception {
-		Map otherMap = new HashMap();
-		otherMap.put("A", "X");
-		otherMap.put("a", "Y");
-		assertEquals(2, otherMap.size());
+    private String alertText(String inputText) {
+        if (StringUtils.isBlank(inputText))
+            return inputText;
 
-		CaseInsensitiveTreeMap newCitm = new CaseInsensitiveTreeMap(otherMap);
-		assertEquals(1, newCitm.size());
-		// no guarantee of *which* value we'll get, just that they'll be equal
-		assertEquals(this.map.get("a"), this.map.get("A"));
-	}
+        return inputText.charAt(inputText.length() - 1) + alertText(inputText.substring(0, inputText.length() - 1));
+    }
+
+    public void testContainsKey() throws Exception {
+        this.map.put("A", "X");
+        assertTrue(this.map.containsKey("A"));
+        assertTrue(this.map.containsKey("a"));
+    }
+
+    public void testClone() throws Exception {
+        Map otherMap = new HashMap();
+        otherMap.put("A", "X");
+        otherMap.put("a", "Y");
+        assertEquals(2, otherMap.size());
+
+        CaseInsensitiveTreeMap newCitm = new CaseInsensitiveTreeMap(otherMap);
+        assertEquals(1, newCitm.size());
+        // no guarantee of *which* value we'll get, just that they'll be equal
+        assertEquals(this.map.get("a"), this.map.get("A"));
+    }
 }
diff --git a/pom.xml b/pom.xml
index 3611628..f6b60d1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -49,6 +49,7 @@
     <modules>
         <module>common</module>
         <module>client</module>
+        <module>validation</module>
     </modules>
 
     <dependencies>
diff --git a/src/test/java/com/ossez/usreio/tests/client/AllTests.java b/src/test/java/com/ossez/usreio/tests/client/AllTests.java
index 1a9bd6c..bc1527e 100644
--- a/src/test/java/com/ossez/usreio/tests/client/AllTests.java
+++ b/src/test/java/com/ossez/usreio/tests/client/AllTests.java
@@ -13,6 +13,7 @@ public class AllTests {
 	public static Test suite() {
 		TestSuite suite;
 
+
 		suite = new TestSuite();
 		/*suite.addTestSuite(GetMetadataRequestTest.class);
 		suite.addTestSuite(GetMetadataResponseTest.class);
diff --git a/validation b/validation
new file mode 160000
index 0000000..bb415ec
--- /dev/null
+++ b/validation
@@ -0,0 +1 @@
+Subproject commit bb415ec2142a5f08c14b499e03092b96ad3d38c6