some renamings.

src/nodes/znode.h

@@ -206,6 +206,12 @@ namespace znode
         return !children().empty();
       }
 
+      //! testet, ob kinder vorhanden sind.
+      bool has_child(str_cref tagname ) const
+      {
+        return child(tagname ) != nullptr;
+      }
+
       //! gibt das erste kind zurück
       zshared_node first_child()
       {
@@ -229,6 +235,17 @@ namespace znode
         return nullptr;
       }
 
+      //
+      zshared_node child(str_cref tagname ) const
+      {
+        for( auto child : _children )
+        {
+          if( child->tag_name() == tagname )
+            return child;
+        }
+        return nullptr;
+      }
+
       //! hängt einen knoten an meine kinderliste an.
       int add_child( const zshared_node& node )
       {
@@ -313,7 +330,7 @@ namespace znode
 
       //! findet den ersten kind-knoten mit dem attribut 'attrkey' welches den
       //! wert 'attrvalue' hat.
-      zshared_node find_child_by_attribute(str_cref attrkey, str_cref attrvalue )
+      zshared_node find_child_by_attribute(str_cref attrkey, str_cref attrvalue ) const
       {
         for( auto child : _children )
         {
@@ -323,18 +340,9 @@ namespace znode
         return nullptr;
       }
 
-      //
-      zshared_node find_child_by_tag_name(str_cref tagname )
-      {
-        for( auto child : _children )
-        {
-          if( child->tag_name() == tagname )
-            return child;
-        }
-        return nullptr;
-      }
 
-      zshared_node find_child_by_id( int id )
+
+      zshared_node find_child_by_id( int id ) const
       {
         for (auto child : _children )
         {