How to create schema that defines value sets

[RedSon]

Can someone provide me with an example of how I define in a schema that I require 25 value sets?

Say in my XML I have:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<linear xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<linedata>
		<line>
			<rise>253</rise>
			<run>446</run>
		</line>
...
</close tags...>

and I have 25 "line" elements how do I enforce that in my xsd?

Thanks.

[jkmyoung]

minOccurs, maxOccurs. This may be at the element level, or other level such as sequence

<xs:element name="lineData">
	<xs:complexType>
		<xs:sequence>
			<xs:element name="line" maxOccurs="25" minOccurs="25"/>
		</xs:sequence>
	</xs:complexType>
</xs:element>

[RedSon]

So this statement says that the element named "line" must occur a min and max time of 25 times?

Thanks I will use that!

[RedSon]

The feedback I received on the schema is that I should use complex types and put them in the element attribute instead of nesting the complex type.

Do you have some reference material on how this can be accomplished. I do not understand what this means.

[jkmyoung]

Basically, use references everywhere to make the schema as flat as possible (1 layer at a time).
There are 2 ways:
1. Reference to elements:
2. Reference to types.

1. Only referencing elements. Notice use of the ref attribute

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="lineData"> 
    <xs:complexType> 
        <xs:sequence> 
            <xs:element ref="line" minOccurs="25" maxOccurs="25"/> 
        </xs:sequence> 
    </xs:complexType> 
</xs:element> 
<xs:element name="line">
    <xs:complexType> 
        <xs:sequence> 
            <xs:element ref="item" minOccurs="25" maxOccurs="25"/> 
        </xs:sequence> 
    </xs:complexType> 
</xs:element>
<xs:element name="item" type="xs:string"/>
</xs:schema>

Compared to 2. Only referencing types: Notice the use of the type attribute.

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="lineData" type="lineDataType"/> 
<xs:complexType name="lineDataType">
    <xs:sequence> 
        <xs:element name="line" minOccurs="25" maxOccurs="25" type="lineType"/> 
    </xs:sequence> 
</xs:complexType>
<xs:complexType name="lineType">
    <xs:sequence> 
        <xs:element name="item" type="xs:string" /> 
    </xs:sequence> 
</xs:complexType>
</xs:schema>

You can also do both 1 and 2, ...which I think is what is being asked