Const qualifiers where access is const, unify formatting
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index 567b9f0..e8dd32b 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -796,8 +796,8 @@
 

 const XMLElement* XMLNode::FirstChildElement( const char* value ) const

 {

-    for( XMLNode* node=_firstChild; node; node=node->_next ) {

-        XMLElement* element = node->ToElement();

+    for( const XMLNode* node = _firstChild; node; node = node->_next ) {

+        const XMLElement* element = node->ToElement();

         if ( element ) {

             if ( !value || XMLUtil::StringEqual( element->Name(), value ) ) {

                 return element;

@@ -810,8 +810,8 @@
 

 const XMLElement* XMLNode::LastChildElement( const char* value ) const

 {

-    for( XMLNode* node=_lastChild; node; node=node->_prev ) {

-        XMLElement* element = node->ToElement();

+    for( const XMLNode* node = _lastChild; node; node = node->_prev ) {

+        const XMLElement* element = node->ToElement();

         if ( element ) {

             if ( !value || XMLUtil::StringEqual( element->Name(), value ) ) {

                 return element;

@@ -824,7 +824,7 @@
 

 const XMLElement* XMLNode::NextSiblingElement( const char* value ) const

 {

-    for( XMLNode* node=this->_next; node; node = node->_next ) {

+    for( const XMLNode* node = _next; node; node = node->_next ) {

         const XMLElement* element = node->ToElement();

         if ( element

                 && (!value || XMLUtil::StringEqual( value, node->Value() ))) {

@@ -837,7 +837,7 @@
 

 const XMLElement* XMLNode::PreviousSiblingElement( const char* value ) const

 {

-    for( XMLNode* node=_prev; node; node = node->_prev ) {

+    for( const XMLNode* node = _prev; node; node = node->_prev ) {

         const XMLElement* element = node->ToElement();

         if ( element

                 && (!value || XMLUtil::StringEqual( value, node->Value() ))) {