The content model of a complex type must consist of 'annotation' (if present); followed by zero or one of the following: ...

The content model of a complex type must consist of 'annotation' (if present); followed by zero or one of the following: 'simpleContent', 'complexContent', 'group', 'choice', 'sequence', or 'all'; followed by zero or more 'attribute' or 'attributeGroup'; followed by zero or one 'anyAttribute'.