To quote its intent "Compose objects into tree structures to represent part-whole hierarchies."
XML documents are tree structures.
The parsing stage creates arbitrary tree structures on the basis of token lists.
The requirement to magnify the view in order to read specific details introduces the same loss of visual context mentioned above in our discussion of large tree structures.
In other words, rather than forcing users to navigate deep, complex tree structures, give them tools to bring appropriate information to them.