Match Patterns (Locating Elements)

One critical capability of a stylesheet language is to locate source elements to be styled. CSS, for example, does this with "selectors." FOSIs do it with "e-i-c's", elements in context. XSLT does it with "match patterns" defined by the XML Path Language (XPath) (http://www.w3.org/TR/xpath).

Two things to remember about XPath expressions: