XML Tutorial/XML Schema/Annotation

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Annotating Schemas: add information about your schema or its elements.

You can create annotations right after the xsd:schema element to document the entire schema.
<annotation id="ID"
            {any attributes with non-schema namespace}>
  Content: (appInfo | documentation)*

File: Schema.xsd
<xsd:schema xmlns:xsd="http://www.w3.org/2000/10/XMLSchema">

Annotations for element tags

<?xml version = "1.0" ?>
<xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema">
         Schema for customer name information.
   <xs:element name = "Customer">
             MiddleInitial is optional 
         <xs:group ref = "NameGroup" />
   <xs:group name = "NameGroup">
         <xs:element name = "FirstName" type = "xs:string" />
         <xs:element name = "MiddleInitial" type = "xs:string" />
         <xs:element name = "LastName" type = "xs:string" />

Annotations provides documentation information, as well as additional application information

<annotation id="unique identifier"> 
The <annotation> declaration can appear as a child of most XML Schema declarations. 
The <annotation> declaration adds two forms of information to your declarations:
Application information 
Documentation information 
Each <annotation> declaration may contain the elements <appinfo> and <documentation>. 
These elements may contain any XML content from any namespace. 
Each of these elements may also contain a source attribute. 
The source attribute is used to refer to an external file that may be used for application information or documentation information. 
Annotations usually include <documentation> declarations to describe the features, or uses, of a particular declaration within the XML Schema.