XML Schema documents can contain global constructs that can be reused within the same schema as the defined construct or inside other XML Schema documents by using xsd:include and xsd:import. All global constructs have a target namespace and a name.

Here is a list of common global constructs that can be added to the root schema element:

• Global complex type definitions
• Global simple type definitions
• Global attribute group definitions
• Global model group definitions
• Global element declarations
• Global attribute declarations