can not be 100% automated (it is at least needed
to post redirection links for older issues)
+Initial application design and development.
+1. Tools focus on a structured data
+2. The first level of the structured data format is a tree
+3. Leaves and nodes are just nodes
+4. For simplicity node values are strings only
+5. Nodes can have type hints to prevent data loss about
+ specific type in source format
+ | S | -> | F | -> ... -> | T |
+[S]ource converts its input format into internal tree
+representation, which then can be passed through several
+[F]ilters that modify the tree. The resulting tree is then
+passed to [T]arget format converter.