XML Demystified

CHAPTER 4 XML Schema
The customer element is a parent element that contains firstname and lastname
elements, which is also similar to the one in the DTD. However, notice that these
elements are defined as a string data type. This is unique to the XML schema. We’ll
examine each component of an XML schema in detail in “An Inside Look at an
XML Schema.”
You save the XML schema to a file called customers.xsd. Next you’ll need to
reference the customers.xsd file from within the XML document. You do this by
inserting the xsi:schemaLocation attribute into the customers tag within the XML
document. We illustrate this in the next revision of the XML document. When the
parser encounters the xsi:schemaLocation attribute, it reads the customers.xsd
XML schema and then applies it to the XML document.