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

tinyxml2.cpp

@@ -1940,17 +1940,17 @@ void XMLPrinter::PushHeader( bool writeBOM, bool writeDec )
 }
 
 
-void XMLPrinter::OpenElement( const char* name )
+void XMLPrinter::OpenElement( const char* name, bool compactMode )
 {
     if ( _elementJustOpened ) {
         SealElement();
     }
     _stack.Push( name );
 
-    if ( _textDepth < 0 && !_firstElement && !_compactMode ) {
+    if ( _textDepth < 0 && !_firstElement && !compactMode ) {
         Print( "\n" );
     }
-    if ( !_compactMode ) {
+    if ( !compactMode ) {
         PrintSpace( _depth );
     }
 
@@ -2002,7 +2002,7 @@ void XMLPrinter::PushAttribute( const char* name, double v )
 }
 
 
-void XMLPrinter::CloseElement()
+void XMLPrinter::CloseElement( bool compactMode )
 {
     --_depth;
     const char* name = _stack.Pop();
@@ -2011,7 +2011,7 @@ void XMLPrinter::CloseElement()
         Print( "/>" );
     }
     else {
-        if ( _textDepth < 0 && !_compactMode) {
+        if ( _textDepth < 0 && !compactMode) {
             Print( "\n" );
             PrintSpace( _depth );
         }
@@ -2021,7 +2021,7 @@ void XMLPrinter::CloseElement()
     if ( _textDepth == _depth ) {
         _textDepth = -1;
     }
-    if ( _depth == 0 && !_compactMode) {
+    if ( _depth == 0 && !compactMode) {
         Print( "\n" );
     }
     _elementJustOpened = false;
@@ -2146,7 +2146,9 @@ bool XMLPrinter::VisitEnter( const XMLDocument& doc )
 
 bool XMLPrinter::VisitEnter( const XMLElement& element, const XMLAttribute* attribute )
 {
-    OpenElement( element.Name() );
+	const XMLElement*	parentElem = element.Parent()->ToElement();
+	bool		compactMode = parentElem ? CompactMode(*parentElem) : _compactMode;
+    OpenElement( element.Name(), compactMode );
     while ( attribute ) {
         PushAttribute( attribute->Name(), attribute->Value() );
         attribute = attribute->Next();
@@ -2155,9 +2157,9 @@ bool XMLPrinter::VisitEnter( const XMLElement& element, const XMLAttribute* attr
 }
 
 
-bool XMLPrinter::VisitExit( const XMLElement& )
+bool XMLPrinter::VisitExit( const XMLElement& element )
 {
-    CloseElement();
+    CloseElement( CompactMode(element) );
     return true;
 }
 

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().
 	*/