id A unique ID for the element. A unique ID for the element. name Name for the element. Cannot be used if ref is present. Name for the element. Cannot be used if ref is present. ref Reference to a named element. Cannot be used if name is present. Reference to a named element. Cannot be used if name is present. type Name of a built-in data type, simpleType, or complexType. Name of a built-in data type, simpleType, or complexType. minOccurs Minimum number of times the element can occur. Value can be >=0. Default is 1. Only usable with ref. Minimum number of times the element can occur. Value can be >=0. Default is 1. Only usable with ref. maxOccurs Maximum number of times the element can occur. Value can be >=0 or unbounded. Default is 1. Only usable with ref. Maximum number of times the element can occur. Value can be >=0 or unbounded. Default is 1. Only usable with ref. nullable false true Whether an explicit null value can be assigned to the element. Default is false. Whether an explicit null value can be assigned to the element. Default is false. abstract false true block final default Default value for the element. Only usable if the element's content is a simple type or text-only. Default value for the element. Only usable if the element's content is a simple type or text-only. fixed Fixed value for the element. Only usable if the element's content is a simple type or text-only. Fixed value for the element. Only usable if the element's content is a simple type or text-only. form qualified unqualified substitutionGroup Name of an element that can be substituted with this one. Only usable if the parent element is schema. Name of an element that can be substituted with this one. Only usable if the parent element is schema.