| Element | Explanation |
|---|---|
| all | Specifies that the child elements can appear in any order. Each child element can occur 0 or 1 time |
| annotation | Specifies the top-level element for schema comments |
| any | Enables the author to extend the XML-document with elements not specified by the schema |
| anyAttribute | Enables the author to extend the XML-document with attributes not specified by the schema |
| appinfo | Specifies information to be used by the application (must go inside annotation) |
| attribute | Defines an attribute |
| attributeGroup | Defines an attribute group to be used in complex type definitions |
| choice | Allows only one of the elements contained in the declaration to be present within the containing element |
| complexContent | Defines extensions or restrictions on a complex type that contains mixed content or elements only |
| complexType | Defines a complex type element |
| documentation | Defines text comments in a schema (must go inside annotation) |
| element | Defines an element |
| extension | Extends an existing simpleType or complexType element |
| field | Specifies an XPath expression that specifies the value used to define an identity constraint |
| group | Defines a group of elements to be used in complex type definitions |
| import | Adds multiple schemas with different target namespace to a document |
| include | Adds multiple schemas with the same target namespace to a document |
| key | Specifies an attribute or element value as a key (unique, non-nullable, and always present) within the containing element in an instance document |
| keyref | Specifies that an attribute or element value correspond to those of the specified key or unique element |
| list | Defines a simple type element as a list of values |
| notation | Describes the format of non-XML data within an XML-document |
| redefine | Redefines simple and complex types, groups, and attribute groups from an external schema |
| restriction | Defines restrictions on a simpleType, simpleContent, or a complexContent |
| schema | Defines the root element of a schema |
| selector | Specifies an XPath expression that selects a set of elements for an identity constraint |
| sequence | Specifies that the child elements must appear in a sequence. Each child element can occur from 0 to any number of times |
| simpleContent | Contains extensions or restrictions on a text-only complex type or on a simple type as content and contains no elements |
| simpleType | Defines a simple type and specifies the constraints and information about the values of attributes or text-only elements |
| union | Defines a simple type as a collection (union) of values from specified simple data types |
| unique | Defines that an element or an attribute value must be unique within the scope |
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