PropertyHandle :: FixKeyComponents - Fix key component values

The function fixes a number of high level key component values, i.e. it acts like a filter, which requires certain values for a number of top key components. Similar to a filter condition, the function reduces the number of instances, which can be read via the property handle. You may call Position() or GetRelative() in order to read consecutive instances from the restricted collection. GetRelativeCount() returns the instance count in the restricted collection.

In order to reset fixed key components one may call the function with switch level AUTO or without parameters.

The function reset previous key selections or implicitly defined key selections (e.g. when opening a property path. The function does work on regular collections, only, i.e. on persistent or transient collections with defined sort orders (indexes). Key selections are reset automatically, when changing the sort order.