All root instances created by a content session become invalid after the content session is closed. Any method called on an invalid root instance will throw an {@code InvalidStateException}.
{@link Tree} instances may become non existing after a call to{@link #refresh()}, {@link #rebase()} or {@link #commit()}. Any write access to non existing {@code Tree} instances will cause an{@code InvalidStateException}. @see Tree Existence and iterability of trees
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