Content Models : complexType « XML Schema « XML Tutorial

In XML Schemas you can specify an element's content model using the following: 

A <sequence>declaration 
A <choice>declaration 
A reference to a global <group>declaration 
An <all>declaration 

Each of these declarations may contain the following: 

Inner content models 
Element declarations 
Element wildcards

3.56.complexType
	3.56.1.	Defining Complex Types
	3.56.2.	To declare an empty content model in a definition
	3.56.3.	Content Models
	3.56.4.	Complex type with sequence
	3.56.5.	Defining Elements to Contain Only Elements
	3.56.6.	Defining Elements with Mixed Content
	3.56.7.	Build complexType with complexType
	3.56.8.	Complex type for element with child elements and attribute
	3.56.9.	When an element contains both child elements and character data, it follows the mixed content model