Provide finer control over indentation inside the XMLPrinter. You'll have to subclass it to override its standard behaviour by overwriting CompactMode().

tinyxml2.h

@@ -1967,7 +1967,7 @@ public:
     /** If streaming, start writing an element.
         The element must be closed with CloseElement()
     */
-    void OpenElement( const char* name );
+    void OpenElement( const char* name, bool compactMode );
     /// If streaming, add an attribute to an open element.
     void PushAttribute( const char* name, const char* value );
     void PushAttribute( const char* name, int value );
@@ -1975,7 +1975,7 @@ public:
     void PushAttribute( const char* name, bool value );
     void PushAttribute( const char* name, double value );
     /// If streaming, close the Element.
-    virtual void CloseElement();
+    virtual void CloseElement( bool compactMode );
 
     /// Add a text node.
     void PushText( const char* text, bool cdata=false );
@@ -2034,6 +2034,8 @@ public:
     }
 
 protected:
+	virtual bool CompactMode( const XMLElement& elem )	{ return _compactMode; };
+
 	/** Prints out the space before an element. You may override to change
 	    the space and tabs used. A PrintSpace() override should call Print().
 	*/