XSD restricting complex type element - validation

Question

I have a XSD definition which looks like this:
<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="ARTICLES">
<xs:complexType>
<xs:sequence>
<xs:element maxOccurs="unbounded" name="ARTICLE">
<xs:complexType>
<xs:sequence>
<xs:element name="NAME" type="xs:string" />
<xs:element name="TYPE" type="xs:unsignedByte" />
<xs:element name="LENGTH" type="xs:unsignedByte" />
<xs:element name="WIDTH" type="xs:unsignedShort" />
<xs:element name="HEIGHT" type="xs:unsignedShort" />
<xs:element maxOccurs="unbounded" name="PRICELIST">
<xs:complexType>
<xs:sequence>
<xs:element name="SALESCONTRACT" type="xs:string" />
<xs:element name="PRICE" type="xs:decimal" />
<xs:element name="VAT" type="xs:unsignedByte" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
An XML can contain a collection of ATRICLES and each ARTICLE can have 1 or more PRICELIST entries
Now I would like to take an element and restrict the value entries. i.e. With a regex or numbers only or in length.
With simpletype I found lots of examples that work with a pattern tag.
How would this work with complex types?
Regards,
Rick

Answer 1

You can simply apply all of those examples you've found using xs:simpleType to any of the parts of ARTICLE that you wish to further constrain. For example, to limit NAME to be of maximum length of 32 characters:
<xs:element name="NAME">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="32"/>
</xs:restriction>
</xs:simpleType>
</xs:element>