Axis: attribute
Element
Node-set
AAA id = a1
id pos
BBB id = b1
id
BBB id = b2
id
AAA id = a2
id
BBB id = b3
id
BBB id = b4
id
CCC id = c1
id
CCC id = c2
id
BBB id = b5
id
CCC id = c3
id