/catalog/cd/price -- get price elements under catelog/cd
//cd -- get all cd elements of file
/catalog/cd/* -- get all elements under cd
/catalog/*/price
/*/*/price
//* -- get all elements of file
--Get elements
/catalog/cd[0] -- get the first element which name is cd under catalog
/catalog/cd[last()] -- get the last element
/catelog/cd[price] -- get all cd elements which contain price child element
/catalog/cd[price=10.90] -- get all cd elements which contain price child element and value is 10.90
/catalog/cd[price-10.90]/price -- get all price elements which cd contain price child element and value is 10.90
--Get more than one path
/catalog/cd/title | catalog/cd/artist
//title | //artist
//title | //artist | //price
--Choose attribute
//@country --choose all country attribute
//cd[@country] -- choose all cd elements contain country attribute
//cd[@*] -- choose all cd elements contain attribute
//cd[@country="UK"] -- choose all cd elements contain attribute and value is UK
//cd[@country="UK"][@name="test"] -- choose all cd elements contain country & name attributes and values are UK & test