#748 - close XML tag explicitly for empty tags with configuration.

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

@@ -877,12 +877,25 @@ public class XML {
                         }
                     }
                 } else if ("".equals(value)) {
-                    sb.append(indent(indent));
-                    sb.append('<');
-                    sb.append(key);
-                    sb.append("/>");
-                    if(indentFactor > 0){
-                        sb.append("\n");
+                    if (config.isCloseEmptyTag()){
+                        sb.append(indent(indent));
+                        sb.append('<');
+                        sb.append(key);
+                        sb.append(">");
+                        sb.append("</");
+                        sb.append(key);
+                        sb.append(">");
+                        if (indentFactor > 0) {
+                            sb.append("\n");
+                        }
+                    }else {
+                        sb.append(indent(indent));
+                        sb.append('<');
+                        sb.append(key);
+                        sb.append("/>");
+                        if (indentFactor > 0) {
+                            sb.append("\n");
+                        }
                     }
 
                     // Emit a new tag <k>

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

@@ -43,6 +43,13 @@ public class XMLParserConfiguration extends ParserConfiguration {
      */
     private boolean convertNilAttributeToNull;
 
+    /**
+     * When creating an XML from JSON Object, an empty tag by default will self-close.
+     * If it has to be closed explicitly, with empty content between start and end tag,
+     * this flag is to be turned on.
+     */
+    private boolean closeEmptyTag;
+
     /**
      * This will allow type conversion for values in XML if xsi:type attribute is defined
      */
@@ -145,12 +152,13 @@ public class XMLParserConfiguration extends ParserConfiguration {
      */
     private XMLParserConfiguration (final boolean keepStrings, final String cDataTagName,
             final boolean convertNilAttributeToNull, final Map<String, XMLXsiTypeConverter<?>> xsiTypeMap, final Set<String> forceList,
-            final int maxNestingDepth) {
+            final int maxNestingDepth, final boolean closeEmptyTag) {
         super(keepStrings, maxNestingDepth);
         this.cDataTagName = cDataTagName;
         this.convertNilAttributeToNull = convertNilAttributeToNull;
         this.xsiTypeMap = Collections.unmodifiableMap(xsiTypeMap);
         this.forceList = Collections.unmodifiableSet(forceList);
+        this.closeEmptyTag = closeEmptyTag;
     }
 
     /**
@@ -169,7 +177,8 @@ public class XMLParserConfiguration extends ParserConfiguration {
                 this.convertNilAttributeToNull,
                 this.xsiTypeMap,
                 this.forceList,
-                this.maxNestingDepth
+                this.maxNestingDepth,
+                this.closeEmptyTag
         );
     }
 
@@ -303,4 +312,13 @@ public class XMLParserConfiguration extends ParserConfiguration {
     public XMLParserConfiguration withMaxNestingDepth(int maxNestingDepth) {
         return super.withMaxNestingDepth(maxNestingDepth);
     }
+
+    public XMLParserConfiguration withCloseEmptyTag(boolean closeEmptyTag){
+        this.closeEmptyTag = closeEmptyTag;
+        return this;
+    }
+
+    public boolean isCloseEmptyTag() {
+        return this.closeEmptyTag;
+    }
 }