The style sheets presented thus far have used <value-of> to retrieve the content of top-level elements and attributes. However, the XML document instance in Listing 2.1 also contains subelements, namely, the address element:
<invoice num=”2317” invoiceDate=”07-09-01”> ... <address> <streetAddress>123 Fourth Street</streetAddress> <city>Sometown</city> <state>CA</state> <zip>12345</zip> <province /> <country>USA</country> </address> ... </invoice>
To retrieve the content from, say, <streetAddress>, you could assign a step pattern in the select attribute of a <value-of> element. That might look something like:
<xsl:value-of select="invoice/address/streetAddress" />
This approach works fine for this example because ...