lesson1 : <schema> Element

msi_333 · **Posted:** Tue Feb 17, 2009 11:51 pm

<schema> Element :
All XML schema have a common element which is <schema> .<schema> element is the root of your XSD schema .

It looks like this :

Code:

<?xml version="1.1"   encoding="UTF-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.codemiles.com" xmlns="http://www.codemiles.com" >
 <!--  other elements here --> 
</xs:schema>

Let us understand what is the meaning of the urls and namespaces in the xml schema :

1 .

Code:

xmlns:xs="http://www.w3.org/2001/XMLSchema"

Means that the datatypes and elements used in this schema comes from this namespace and it should be perfix with "xs" .

2.

Code:

targetNamespace="http://www.codemiles.com"

The new elements defined in this schema comes from this namespace url.

3.

Code:

xmlns="http://www.codemiles.com"

Default namespace ,used if you didn't found the first one .

Once you create your XML schema , you can generate a XML file and put a link to it XML schema as a reference in validation. For example :

Code:

<?xml version="1.0"?>

<school xmlns="http://www.codemiles.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.codemiles.com school.xsd">

<Name>School number  1</to>
<Location>Near train station</from>
<Size>1000m'2 </heading>

</school>

as you may noticed :

Code:

xsi:schemaLocation="http://www.codemiles.com school.xsd"

Used as a reference to your XML schema .

lesson1 : <schema> Element

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