An empty complex element cannot have contents, only attributes.
An empty XML element:
The "product" element above has no content at all. To define a type with no content, we
must define a type that allows elements in its content, but we do not actually declare any
elements, like this:
In the example above, we define a complex type with a complex content. The complexContent element
signals that we intend to restrict or extend the content model of a complex type, and the
restriction of integer declares one attribute but does not introduce any element content.
However, it is possible to declare the "product" element more compactly, like this:
Or you can give the complexType element a name, and let the "product" element have a
type attribute that refers to the name of the complexType (if you use this method, several
elements can refer to the same complex type):
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