An "elements-only" complex type contains an element that contains only other elements.
An XML element, "person", that contains only other elements:
You can define the "person" element in a schema, like this:
Notice the <xs:sequence> tag. It means that the elements defined ("firstname" and "lastname") must appear in that order inside a "person" element.
Or you can give the complexType element a name, and let the "person" 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):