Compares the node and it's children to a reference problem and it's diagnostics

remove HTML cruft to produce a clean description

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Set the user-defined data. This data is never touched by the scanner. * @param user_defined The data to be associated with this scanner. * @param yy

@param retries When this is nonzero, then doMoreCleanup will do the specified amount of cycles doing the cleanup without permanently locking the du-ch

* @return the last two segments of @p document's path or an empty string in case of failure. */