HTML Quick Reference - HTML5 and CSS Comprehensive - page 694

Table H-9 XSD Elements

Element Name Description

all Indicates child elements can appear in any order (see sequence)

annotation Indicates the top-level element for schema comments

any Allows extension of the XML document with elements not defined by the schema

anyAttribute Allows extension of the XML document with attributes not defined by the schema

appInfo Contained within an annotation element; holds information to be used by the

application

attribute Defines an attribute

attributeGroup Defines an attribute group to be used in complex type definitions

choice Within a group, choice, sequence, complexType, or restriction elements, only one of

the elements may be present within the element

complexContent Indicates whether mixed content is allowed; an element of xs:extension allows

mixed, whereas xs:restriction does not allow mixed content

complexType Defines a complex type element

documentation Contained with the annotation for comments about the schema

element Defines an element

extension Extends an existing simpleType or complexType element

ield An XPath expression used by unique, key, or keyref

group Defines a group of elements used in a complex type definition

import References schemas for namespace for additional namespace definitions

include Used to break large schemas into smaller parts

key Indicates an attribute or element value as a key that must be unique

keyref Defines constraints on specified key or unique element

list Available only in a simple type element to specify a list of values to be used in content

notation Allows the format of non-XML data

redefine Redefines simple, complex types, and groups (see include)

restriction Defines restrictions on a simpleType, simpleContent, or a complexContent to clarify

domains (valid ranges)

schema Defines the root element of a schema

selector Selects a set of elements for an identity constraint (see key, unique, keyref)

sequence Indicates that the child elements must appear in a sequence.

simpleContent Used in complexType elements to define simple content such as text and attributes

simpleType Defines a simple type and specifies the constraints and information about the values

of attributes or text-only elements

union Allows creation of simple type as a collection (union) of more than one type of data

unique Indicates that an element or an attribute value must be unique within the document

Simple Types
A simple element is an XML element that does not contain any other elements or
attributes. In the XSD, the <element> tag declares the name of the element and its data
type. A sample simple XML element and its associated schema is shown in Table H-10.

Table H-10 Simple Type Element

Simple XML Element XML Schema

an XML element that contain only text
<irst_name>Bill</irst_name>

<xs:element name="irst_name" type=" xs:string" />