XML两个名称相同的标签

Question

In my XML document I have two tags with the same name, both are called item, I have now created an XML schema for this document, considering that I have two tags with the same name, is my XML schema accurate?

XML document

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

<shiporder orderid="889923" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="shiporder.xsd"> 
    <orderperson>John Smith</orderperson> 
        <shipto> 
            <name>Ola Nordmann</name> 
            <address>Langgt 23</address> 
            <city>4000 Stavanger</city> 
            <country>Norway</country> 
        </shipto> 
        <item> <!--First Item Tag-->
            <title>Empire Burlesque</title> 
            <note>Special Edition</note> 
            <quantity>1</quantity> 
            <price>10.90</price> 
        </item> 
        <item> <!--Second Item Tag-->
            <title>Hide your heart</title> 
            <quantity>1</quantity> 
            <price>9.90</price> 
        </item> 

XML Schema

<?xml version="1.0" encoding="UTF-8"?> 
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified"> 

<xs:element name="shiporder">
    <xs:complexType >
        <xs:sequence>
            <xs:element name="orderperson"/>
            <xs:element name="shipto">
                <xs:complexType>
                    <xs:sequence>
                    `   <xs:element name="name" type="xs:string"/>
                        <xs:element name="address" type="xs:string"/>
                        <xs:element name="city" type="xs:string"/>
                        <xs:element name="country" type="xs:string"/>
                        <xs:element name="item"> <!--Only 1 item tag defined in the schema-->
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element name="title" type="xs:stri+ng"/>
                                        <xs:element name="note" type="xs:string"/>
                                        <xs:element name="quantity" type="xs:integer"/>
                                        <xs:element name="price" type="xs:decimal"/>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
    </xs:complexType>
</xs:element>
</xs:schema>

Answer 1

To match your XML instance, you should make some changes in your XML Schema.

(I'm assuming you wanted to declare item and not items .)

First, you are defining item as a child element of shipto when I believe (from your XML instance and from the meaning of the tags) it should probably be at the same level:

 <xs:element name="shiporder">
    <xs:complexType >
        <xs:sequence>
            <xs:element name="orderperson"/>
            <xs:element name="shipto">
               ...
            </xs:element>
            <xs:element name="item">
               ...
            </xs:element>
        </xs:sequence>
    </xs:complexType>

</xs:element>

To allow more than one item you can declare maxOccurs="unbounded" or define a lower limit:

<xs:element name="item" maxOccurs="unbounded">

You also need to declare the attribute in shiporder . It should be done in the complexType definition:

<xs:element name="shiporder">
    <xs:complexType >
        <xs:sequence>
          ...
        </xs:sequence>
        <xs:attribute name="orderid" type="xs:string" />
    </xs:complexType>
</xs:element>

Finally, you have to decide whether note is optional or not. If it's optional, then declare

<xs:element name="note" type="xs:string" minOccurs="0"/>

since the default is 1 . If it's not optional, then you have to include it in your XML instance otherwise it will not validate.