A schema-node path is an absolute YANG schema-node
identifier as defined by the YANG ABNF rule
'absolute-schema-nodeid', except that module names are used
instead of prefixes.
This string additionally follows the following rules:
- The leftmost (top-level) data node name is always in the
namespace-qualified form.
- Any subsequent schema-node name is in the
namespace-qualified form if the node is defined in a
module other than its parent node. Otherwise, the
simple form is used. No predicates are allowed.