[1] [CITE[X Sharp/Nodes]] ([TIME[2009-01-22 20:51:58 +09:00]] 版) <http://wiki.codeglide.com/X_Sharp/Nodes#Selecting_nodes>

>XPath expressions can be used within the <?xpath ?> instruction to select and pass nodes to the current output collection, for example: 
>
[PRE(XML example code)[
<!-- Add to the output collection only books with prices under $50 -->
<?xpath $library/book[@price < 50] ?>
]PRE]