[Adam89]

Hey everyone,

For the past few days I've been trying to produce an XSD schema that will validate my simple products XML. At first I tried it with the full XML and ran into several issues, so I tried to take things back a step.

For this very simple XML:

<?xml version="1.0"?>
<products>
    <product>
        <title>Product A</title>
    </product>
</products>

I have this schema:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="products">
        <xs:sequence>
            <xs:element name="product">
                <xs:sequence>
                    <xs:complexType>
                        <xs:element name="title" type="xs:string" />
                    </xs:complexType>
                </xs:sequence>
            </xs:element>
        </xs:sequence>
    </xs:element>
</xs:schema>

However when I try and validate this using an online tool (tried several), I get back this error message:

4s-elt-must-match.1: The content of 'products' must match (annotation?, (simpleType | complexType)?, (unique | key | keyref)*)). A problem was found starting at: sequence.

I feel like I'm missing something really fundamental here, but just can't figure out what?

Edit

I also tried the following schema:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="products">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="product">
                    <xs:sequence>
                        <xs:complexType>
                            <xs:element name="title" type="xs:string" />
                        </xs:complexType>
                    </xs:sequence>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Neither work.

Any help would be extremely appreciated!

Thanks

Adam

[xml-profi]

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
  <xs:element name="products">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="product"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="product">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="title"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="title" type="xs:string"/>
</xs:schema>

[Adam89]

Thanks. Looking at that, I'm guessing you can't have a complexType within another?

[Adam89]

Okay I managed to take things a step further, and add in some of the missing values:

<?xml version="1.0"?>
<products>
    <product>
        <title>Product A</title>
        <stock>
            <available>123</available>
            <ordered>123</ordered>
            <delivery>2011-06-01</delivery>
        </stock>
        <stats>
            <total_sold>123</total_sold>
            <per_order_average>123.12</per_order_average>
            <all_order_average>123.12</all_order_average>
        </stats>
    </product>
</products>

XSD:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

    <xs:element name="products">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="product" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>

    <xs:element name="product">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="title" type="xs:string" />
                <xs:element ref="stock" />
                <xs:element ref="stats" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>

    <xs:element name="stock">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="available" type="xs:integer" />
                <xs:element name="ordered" type="xs:integer" />
                <xs:element name="delivery" type="xs:date" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>

    <xs:element name="stats">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="total_sold" type="xs:integer" />
                <xs:element name="per_order_average" type="xs:decimal" />
                <xs:element name="all_order_average" type="xs:decimal" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>

</xs:schema>

This validates! Great stuff. How could I add an attribute to <product> though?

I've tried adding it like:

    <xs:element name="product">
        <xs:complexType>
            <xs:attribute name="id" type="xs:integer" />

And several other variations, but no luck!

Thanks for your help.

[xml-profi]

<xs:element name="product">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="title"/>
      </xs:sequence>
	  <xs:attribute ref="id" use="required"/>
    </xs:complexType>
	
  </xs:element>
  
  <xs:attribute name="id" type="xs:integer"/>