3. Start whith

If the path starts with // then all elements in the document which fulfill following criteria are selected.

//BBB

Select all elements BBB

<AAA>

<BBB/>

<CCC/>

<BBB/>

<DDD>

<BBB/>

</DDD>

<CCC>

<DDD>

<BBB/>

<BBB/>

</DDD>

</CCC>

</AAA>

//DDD/BBB

Select all elements BBB which are children of DDD

<AAA>

<BBB/>

<CCC/>

<BBB/>

<DDD>

<BBB/>

</DDD>

<CCC>

<DDD>

<BBB/>

<BBB/>

</DDD>

</CCC>

</AAA>