Hi check out below XML

<fish>
<fish1>
<name> f1 </name>
</fish1>
<fish2>
<name> f2 </name>
</fish2>
<fish3>
<name> f3 </name>
</fish3>
</fish>

and you want to select this fish1 and fish3 then use belwo xpath /fish/*[contains('fish1fish3',name())] this will give you NodeList which will contain fish1 and fish3 nodes if your filter includes number of nodes so that writing each name is inefficient then you should use another approach.

Just go through XSLT programmers reference by micheal kay. (chapter 4,5,7) this will hardly take you 2-3 hours and use w3schools for initial brushing for 15 minutes i think would suffice.

One of the worst programming practice i have ever seen was like this, Dim Comma As String = "," and then he used this variable whenever he wanted to used Comma in other strings. Initially i wondered what this Comma means and then clicked go to definition and just horrified. murder of programming......