Global and Local Simple-Type Elements

When an element is declared globally then it can be referenced by any other element declaration.

When an element is declared globally then it can be referenced by any other element declaration.
Global and Local Simple-Type Elements

When an element is declared globally then it can be referenced by any other element declaration. Declare the element as a child of the xs:schema element then it is considered as global and now it can be reused many time by other elements.

For example: line1 and line2 elements are global and can be referenced by Address element.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
       <xs:element name="line1" type="xs:string"/>
       <xs:element name="line2" type="xs:string"/>
       <xs:element name="Address">
            <xs:complexType>
                 <xs:sequence>
                      <xs:element ref="line1"/>
                      <xs:element ref="line2"/>
                 </xs:sequence>
            </xs:complexType>
       </xs:element>
</xs:schema>

You can also define the type of an element locally. The local type is unnamed and that type is available to that element only.

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
     <xs:element name="myelm1">
          <xs:complexType>
               <xs:sequence>
                   <xs:element name="myelm2">
                        <xs:simpleType>
                           <xs:restriction base="xs:string">
                               <xs:length value="10"/>
                           </xs:restriction>
                        </xs:simpleType>
                   </xs:element>
               </xs:sequence>
          </xs:complexType>
     </xs:element>
</xs:schema>

Ads