Java uses schema constraint XML file

To constrain an XML file with a schema:

Take the Computer.xml file as an example.

1. Create a computer.xml file.

<?xml version= "1.0" encoding= "UTF-8"?>
<computers
Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"
Xmlns= "Http://www.example.org/computer"
xsi:schemalocation= "Http://www.example.org/computer computer.xsd"
>

<computer>
<memories>
<memory>
<size>1G</size>
</memory>
<memory>
<size>2G</size>
</memory>
</memories>
</computer>

</computers>

1.2. Create a computer.xsd file.

<?xml version= "1.0" encoding= "UTF-8"?>

<schema xmlns= "Http://www.w3.org/2001/XMLSchema"

Targetnamespace= "Http://www.example.org/computer"

Xmlns:tns= "Http://www.example.org/computer"

Xmlns:mem= "Http://www.example.org/memory" elementformdefault= "qualified"

>

<element name= "Computers" >

<complexType>

<sequence>

<element name= "Computer" type= "Tns:computertype" >

</sequence>

</complexType>

</element>

<complextype name= "ComputerType" >

<all>

<element name= "Memories" >

<complexType>

<sequence>

<element name= "Memory" minoccurs= "1" maxoccurs= "2" ></element>

</sequence>

</complexType>

</element>

</all>

</complexType>

</schema>

2. Create a computer.xml file.

<?xml version= "1.0" encoding= "UTF-8"?>
<computers
Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"
Xmlns= "Http://www.example.org/computer"
Xmlns:mem= "Http://www.example.org/memory"
xsi:schemalocation= "Http://www.example.org/computer computer.xsd
Http://www.example.org/memory memory.xsd "
>
<!--the following two sentences need to be added during the nesting process.

Xmlns:mem= "Http://www.example.org/memory"
xsi:schemalocation= "Http://www.example.org/memory memory.xsd"
-
<computer>
<memories>
<memory>
<mem:size>1G</mem:size>
</memory>
<memory>
<mem:size>2G</mem:size>
</memory>
</memories>
</computer>
</computers>

2.2. Create a computer.xsd file.

<?xml version= "1.0" encoding= "UTF-8"?> <schema xmlns= "Http://www.w3.org/2001/XMLSchema" targetnamespace= " Http://www.example.org/computer "

Xmlns:tns= "Http://www.example.org/computer"

Xmlns:mem= "Http://www.example.org/memory"

elementformdefault= "qualified" >

<!--add a couple of sentences to the nesting process.

Xmlns:mem= "Http://www.example.org/memory"

<import namespace= "Http://www.example.org/memory" schemalocation= "Memory.xsd" ></import>

-

<import namespace= "Http://www.example.org/memory" schemalocation= "Memory.xsd" ></import>

<element name= "Computers" >

<complexType>

<sequence>

<element name= "Computer" type= "Tns:computertype" ></element>

</sequence>

</complexType>

</element>

<complextype name= "ComputerType" >

<all>

<element name= "Memories" >

<complexType>

<sequence>

<element name= "Memory" type= "Mem:memorytype" minoccurs= "1" maxoccurs= "2" >

</element>

</sequence>

</complexType>

</element>

</all>

</complexType>

</schema>

2.3 Create a memory.xsd file.

<?xml version= "1.0" encoding= "UTF-8"?>

<schema xmlns= "Http://www.w3.org/2001/XMLSchema"

Targetnamespace= "Http://www.example.org/memory"

Xmlns:tns= "Http://www.example.org/memory"

elementformdefault= "qualified" >

<complextype name= "Memorytype" >

<all>

<element name= "Size" type= "string" ></element>

</all>

</complexType>

</schema>

Java uses schema constraint XML file