Addressed comment

src/main/java/org/json/XML.java

@@ -360,9 +360,9 @@ public class XML {
                                 && NULL_ATTR.equals(string)
                                 && Boolean.parseBoolean((String) token)) {
                             nilAttributeFound = true;
-                        } else if(config.xsiTypeMap != null
+                        } else if(config.getXsiTypeMap() != null && !config.getXsiTypeMap().isEmpty()
                                 && TYPE_ATTR.equals(string)) {
-                            xmlXsiTypeConverter = config.xsiTypeMap.get(token);
+                            xmlXsiTypeConverter = config.getXsiTypeMap().get(token);
                         } else if (!nilAttributeFound) {
                             jsonObject.accumulate(string,
                                     config.isKeepStrings()

src/main/java/org/json/XMLParserConfiguration.java

@@ -23,6 +23,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
+import java.util.Collections;
 import java.util.Map;
 
 
@@ -62,7 +63,7 @@ public class XMLParserConfiguration {
     /**
      * This will allow type conversion for values in XML if xsi:type attribute is defined
      */
-    public Map<String, XMLXsiTypeConverter<?>> xsiTypeMap;
+    private Map<String, XMLXsiTypeConverter<?>> xsiTypeMap;
 
     /**
      * Default parser configuration. Does not keep strings (tries to implicitly convert
@@ -72,6 +73,7 @@ public class XMLParserConfiguration {
         this.keepStrings = false;
         this.cDataTagName = "content";
         this.convertNilAttributeToNull = false;
+        this.xsiTypeMap = Collections.emptyMap();
     }
 
     /**
@@ -148,14 +150,13 @@ public class XMLParserConfiguration {
      *                                  <code>false</code> to parse values with attribute xsi:nil="true" as {"xsi:nil":true}.
      * @param xsiTypeMap  <code>new HashMap<String, XMLXsiTypeConverter<?>>()</code> to parse values with attribute
      *                   xsi:type="integer" as integer,  xsi:type="string" as string
-     *                    <code>null</code> to use default behaviour.
      */
-    public XMLParserConfiguration (final boolean keepStrings, final String cDataTagName,
+    private XMLParserConfiguration (final boolean keepStrings, final String cDataTagName,
             final boolean convertNilAttributeToNull, final Map<String, XMLXsiTypeConverter<?>> xsiTypeMap ) {
         this.keepStrings = keepStrings;
         this.cDataTagName = cDataTagName;
         this.convertNilAttributeToNull = convertNilAttributeToNull;
-        this.xsiTypeMap = xsiTypeMap;
+        this.xsiTypeMap = Collections.unmodifiableMap(xsiTypeMap);
     }
 
     /**
@@ -171,7 +172,8 @@ public class XMLParserConfiguration {
         return new XMLParserConfiguration(
                 this.keepStrings,
                 this.cDataTagName,
-                this.convertNilAttributeToNull
+                this.convertNilAttributeToNull,
+                this.xsiTypeMap
         );
     }
     
@@ -253,4 +255,30 @@ public class XMLParserConfiguration {
         newConfig.convertNilAttributeToNull = newVal;
         return newConfig;
     }
+
+    /**
+     * When parsing the XML into JSON, specifies that the values with attribute xsi:type
+     * will be converted to target type defined to client in this configuration
+     * <code>Map<String, XMLXsiTypeConverter<?>></code> to parse values with attribute
+     * xsi:type="integer" as integer,  xsi:type="string" as string
+     * @return {@link #xsiTypeMap} unmodifiable configuration map.
+     */
+    public Map<String, XMLXsiTypeConverter<?>> getXsiTypeMap() {
+        return this.xsiTypeMap;
+    }
+
+    /**
+     * When parsing the XML into JSON, specifies that the values with attribute xsi:type
+     * will be converted to target type defined to client in this configuration
+     * <code>Map<String, XMLXsiTypeConverter<?>></code> to parse values with attribute
+     * xsi:type="integer" as integer,  xsi:type="string" as string
+     * @param xsiTypeMap  <code>new HashMap<String, XMLXsiTypeConverter<?>>()</code> to parse values with attribute
+     *                   xsi:type="integer" as integer,  xsi:type="string" as string
+     * @return The existing configuration will not be modified. A new configuration is returned.
+     */
+    public XMLParserConfiguration withXsiTypeMap(final Map<String, XMLXsiTypeConverter<?>> xsiTypeMap) {
+        XMLParserConfiguration newConfig = this.clone();
+        newConfig.xsiTypeMap = Collections.unmodifiableMap(xsiTypeMap);
+        return newConfig;
+    }
 }

src/test/java/org/json/junit/XMLTest.java

@@ -1008,8 +1008,7 @@ public class XMLTest {
                 return Integer.valueOf(value);
             }
         });
-        JSONObject actualJson = XML.toJSONObject(originalXml, new XMLParserConfiguration(false,
+        JSONObject actualJson = XML.toJSONObject(originalXml, new XMLParserConfiguration().withXsiTypeMap(xsiTypeMap));
-                "content", false, xsiTypeMap));
         Util.compareActualVsExpectedJsonObjects(actualJson,expectedJson);
     }
 
@@ -1030,8 +1029,7 @@ public class XMLTest {
                 return Integer.valueOf(value);
             }
         });
-        JSONObject actualJson = XML.toJSONObject(originalXml, new XMLParserConfiguration(false,
+        JSONObject actualJson = XML.toJSONObject(originalXml, new XMLParserConfiguration().withXsiTypeMap(xsiTypeMap));
-                "content", false, xsiTypeMap));
         Util.compareActualVsExpectedJsonObjects(actualJson,expectedJson);
     }