The user can navigate the XML node tree. The XPath expression in
the middle frame identifies the selected XML node. Anonymous repeating
groups (repeating choice, repeating sequence) are represented by
the location steps _choice and _sequence. The user can navigate
up to any ancestor of the selected node by clicking onto the corresponding
XPath location step. The lower left frame links to the child nodes
of the selected XML node (down navigation). If the down navigation
is unambigious the xsbrowser automatically navigates down until
it needs a user decision (choice, selection of an instance).
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