In section "19.8.7.4 Streamability of union, intersect, and except expressions", several examples are given in the rules. Since we made the attribute and namespace axes striding, these examples are not valid in regards to the text anymore:

<quote>
3. If both operands are climbing, then climbing and and the wider of the sweeps of the two operands (Example: @* | */@*).
</quote>

Example is not valid, it is not climbing. Alternative can be something like .. | ancestor::account.

<quote>
5. Otherwise, roaming and free-ranging (Example: name | @name).
</quote>

Example is not valid (it is crawling, see rule #4). Alternative is something like name | ancestor::name.

Bug was originally reported internally by Eugene Fotin.