XPath

http://zvon.org/comp/tests/r/test-xlab.html#XPath_1~Expressions
//*[contains(@bbb,'22')]

<AAA>
<BBB aaa="111" bbb="222">
<CCC/>
<CCC xxx="555" yyy="666" zzz="777"/>
</BBB>
<BBB aaa="999">
<CCC xxx="qq"/>
<DDD xxx="ww"/>
<EEE xxx="oo"/>
</BBB>
<BBB>
<DDD xxx="oo"/>
</BBB>
</AAA>

//*[@*='222']