Help with Schema

["Wilson David" <David.Wilson@iie.qld.gov.au>]

I am developing a schema and have come across several issues which I need some help with.

1. For one of the elements valid data is defined by multiple number ranges, eg the value must be between 100000 and 399999 or be in the range 25 to 60. While I can define a single range using the mininclusive and maxinclusive tags as shown below, I need help with the multiple range problem. 

	<xs:element name="Cost Code">
		<xs:simpleType>
			<xs:restriction base="xs:integer">
				<xs:minInclusive value="100000"/>
				<xs:maxInclusive value="399999"/>
			</xs:restriction>
		</xs:simpleType>
	</xs:element>

2. One of the elements will have the format of two letters followed by eight digits (eg PP12345678). As shown below using Value="\i{2}\d{8}" works. However the value of the initial two letters within this string will come from a small defined list. The eight digits will come from one or more number ranges. I am not sure how to incorporate this into the schema.

	<xs:element name="Asset Number">
		<xs:simpleType>
			<xs:restriction base="xs:string">
				<xs:pattern value="\i{2}\d{8}"/>
			</xs:restriction>
		</xs:simpleType>
	</xs:element>


3. Two elements within the schema have an either / or relationship. A valid XML document can contain only one of these elements, not both. How can this be reflected in a schema? 

If this is not the appropriate forum for questions of this type I would be grateful if you could point me in the right direction.

Thanks

David 
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