XPath Tutorial

<Peoples>
    <People>
        <Name Age="26" Gender="M">John</Name>
        <Status>Single</Status>
        <Occupation>Accountant</Occupation>
    </People>
    <People>
        <Name Age="31" Gender="M">David</Name>
        <Status>Married</Status>
        <Occupation>Engineer</Occupation>
        <Children>
            <Name Gender="M">Ryan</Name>
            <Name Age="5" Gender="F">Peggy</Name>
        </Children>
    </People>
</Peoples>

Root	/Peoples
Name	/Peoples/People/Name or //People/Name (John, David) //Name or //*[name()='Name'] (John, David, Ryan, Peggy) //People/Children/Name or //Children/Name (Ryan, Peggy)
Status	/Peoples/People/Status or //Status or //*[name()='Status'] (Single, Married)
Descendent of people	//People/descendant::* (John Single Accountant David Married Engineer Ryan Peggy)

All Element	/*
Name with 3 ancestor	/*/*/*/Name (Ryan, Peggy)
Name with 2 ancestor	/*/*/Name (John, David)
First //People/Status	//People/Status[1] (Single)
First //Children/Name	//People/Children/Name[1] (Ryan)
Second //People/Name	//People/Name[2] (David)
Last //People/Status	//People/Status[last()] (Married)
Age attribute	//@Age (26,31,5) //Name[@Age] (John, David, Peggy) //Name[@Age='31'] (David) //Name[@Gender='M'] (John,David)
All attribute	//@* (26 M,31 M,M,5 F)
No Age attribute	//Name[not(@Age)] (Ryan)
Element with 3 descendent	//*[count(*)=3] <People>     <Name Age="26" Gender="M">John</Name>     <Status>Single</Status>     <Occupation>Accountant</Occupation> </People>
Name and Status	//Name | //Status (John Single, David Married, Ryan, Peggy)
Select ancestors	//Children/ancestor::* People & Peoples
Following sibling	//Name/following-sibling::* Status & Occupation & Children (Single Accountant,Married Engineer Ryan Peggy)
Preceding sibling	//Occupation/preceding-sibling::* Name & Status (John Single, David Married)