XML Schema Reference Manual

XSD Elements

Element Description
all Specifies that child elements can appear in any order, and each child element can appear zero or one time.
annotation The annotation element is a top-level element that specifies comments for a schema.
any Allows creators to extend XML documents with elements not specified by the schema.
anyAttribute Allows creators to extend XML documents with attributes not specified by the schema.
appInfo Specifies information to be used by applications within the annotation element.
attribute Defines an attribute.
attributeGroup Defines an attribute group used in complex type definitions.
choice Allows only one element to appear within the containing element in a <choice> declaration.
complexContent Defines extensions or restrictions on complex types (containing mixed content or elements only).
complexType Defines a complex type.
documentation Defines text comments in a schema.
element Defines an element.
extension Extends an existing simpleType or complexType element.
field Specifies an XPath expression that specifies the values used to define identity constraints.
group Defines an element group used in complex type definitions.
import Adds multiple schemas with different target namespaces to a document.
include Adds multiple schemas with the same target namespace to a document.
key Specifies that an attribute or element value (or a set of values) must be a key within a specified scope.
keyref Specifies that attribute or element values (or a set of values) correspond to the values of a specified key or unique element.
list Defines a simple type as a list of values of a specified data type.
notation Describes the format of non-XML data in an XML document.
redefine Redefines simple and complex types, groups, and attribute groups obtained from an external schema file.
restriction Defines constraints on simpleType, simpleContent, or complexContent.
schema Defines the root element of a schema.
selector Specifies an XPath expression that selects a set of elements for identity constraints.
sequence Requires that child elements must appear in order. Each child element can appear zero to any number of times.
simpleContent Contains extensions or restrictions on a complexType element and does not contain any elements.
simpleType Defines a simple type, specifying constraints and information about the values of attributes or text-only elements.
union Defines a collection of multiple simpleType definitions.
unique Specifies that an attribute or element value (or a combination of attribute or element values) must be unique within a specified scope.

XSD Restrictions/Facets

See XSD Restrictions / Facets

Facet Description
enumeration Defines a list of acceptable values.
fractionDigits Defines the maximum number of decimal places allowed. Must be greater than or equal to 0.
length Defines the exact number of characters or list items allowed. Must be greater than or equal to 0.
maxExclusive Defines the upper bound of numeric values. Allowed values must be less than this value.
maxInclusive Defines the upper bound of numeric values. Allowed values must be less than or equal to this value.
maxLength Defines the maximum number of characters or list items allowed. Must be greater than or equal to 0.
minExclusive Defines the lower bound of numeric values. Allowed values must be greater than this value.
minInclusive Defines the lower bound of numeric values. Allowed values must be greater than or equal to this value.
minLength Defines the minimum number of characters or list items allowed. Must be greater than or equal to 0.
pattern Defines an exact sequence of acceptable characters.
totalDigits Defines the exact number of Arabic digits allowed. Must be greater than 0.
whiteSpace Defines how whitespace characters (line feeds, carriage returns, spaces, and tabs) are handled.
Other Extensions