XML/XML Schema/pattern

Define a comma-separated list ignoring whitespaces between values and commas

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xs:simpleType name="myType">
    <xs:restriction base="xs:token">
      <xs:pattern value="(1|2|3)( *, *(1|2|3))*" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

Define the intersection of the block L (all the letters) and the BasicLatin (ASCII characters below #x7F)

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xs:simpleType name="BasicLatinLetters">
    <xs:restriction>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:pattern value="\p{IsBasicLatin}*" />
        </xs:restriction>
      </xs:simpleType>
      <xs:pattern value="\p{L}*" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

ISBN type by pattern

File: Data.xml

<?xml version="1.0"?>
<Books xmlns="http://www.wbex.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.wbex.ru Schema.xsd">
        <Book>
                <Title>title 1</Title>
                <Author>author 1</Author>
                <Date>2008</Date>
                <ISBN>1-11111-111-1</ISBN>
                <Publisher>Publisher 1</Publisher>
        </Book>
        <Book>
                <Title>title 2</Title>
                <Author>author 2</Author>
                <Date>2007</Date>
                <ISBN>0-111-11111-1</ISBN>
                <Publisher>Publisher 2</Publisher>
        </Book>
</Books>
File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.wbex.ru"
            xmlns="http://www.wbex.ru"
            elementFormDefault="qualified">
    <xsd:simpleType name="ISBN-type">
        <xsd:restriction base="xsd:string">
            <xsd:pattern value="\d{1}-\d{5}-\d{3}-\d{1}|\d{1}-\d{3}-\d{5}-\d{1}|\d{1}-\d{2}-\d{6}-\d{1}"/>           
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:element name="Books">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="Book" maxOccurs="unbounded">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="Title" type="xsd:string"/>
                            <xsd:element name="Author" type="xsd:string"/>
                            <xsd:element name="Date" type="xsd:gYear"/>
                            <xsd:element name="ISBN" type="ISBN-type"/>
                            <xsd:element name="Publisher" type="xsd:string"/>
                        </xsd:sequence>
                    </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

Oring and Grouping: "|" character is the "or" operator

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xs:simpleType name="myByte">
    <xs:restriction base="xs:byte">
      <xs:pattern value="1|2|3" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

The xs:pattern facet is the only facet that can be applied multiple times.

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xsd:simpleType name="nonScientific">
    <xsd:restriction base="xsd:float">
      <xsd:pattern value="[^eE]*" />
    </xsd:restriction>
  </xsd:simpleType>
  <xsd:simpleType name="noScientificNoLeading0">
    <xsd:restriction base="nonScientific">
      <xsd:pattern value="[^0].*" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>

Unicode blocks

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xs:simpleType name="BasicLatinToken">
    <xs:restriction base="xs:token">
      <xs:pattern value="\p{IsBasicLatin}*" />
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="Latin-1Token">
    <xs:restriction base="xs:token">
      <xs:pattern value="[\p{IsBasicLatin}\p{IsLatin-1Supplement}]*" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

Use pattern to control the extension name of image type

File: Data.xml

<?xml version="1.0"?>
<products xmlns ="http://www.wbex.ru"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://www.wbex.ru Schema.xsd">
      <product>
          <name>name 1</name>
          <image>a.gif</image>
          <description>description 1</description>
          <warranty>lifetime warranty</warranty>
          <cost>41.95</cost>
          <retailer>http://www.wbex.ru</retailer>
      </product>
      <product>
          <name>name 2</name>
          <image>b.gif</image>
          <description>description 2</description>
          <cost>239.00</cost>
          <retailer>http://www.wbex.ru</retailer>
      </product>
</products>
File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.wbex.ru"
            xmlns="http://www.wbex.ru"
            elementFormDefault="qualified">
    <xsd:element name="products">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="product" minOccurs="0" maxOccurs="unbounded">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="name" type="xsd:string"/>
                            <xsd:element name="image" type="imageType"/>
                            <xsd:element name="description" type="xsd:string"/>
                            <xsd:element name="warranty" type="xsd:string" minOccurs="0"/>
                            <xsd:element name="weight" type="xsd:positiveInteger" minOccurs="0"/>
                            <xsd:element name="cost" type="money" maxOccurs="unbounded"/>
                            <xsd:element name="retailer" type="xsd:anyURI"/>
                        </xsd:sequence>
                     </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:simpleType name="money">
        <xsd:restriction base="xsd:decimal">
            <xsd:fractionDigits value="2"/>
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="imageType">
        <xsd:restriction base="xsd:string">
            <xsd:pattern value="(.)+\.(gif|jpg|jpeg|bmp)"/>
        </xsd:restriction>
    </xsd:simpleType>
</xsd:schema>

Wildcard: integers that are multiples of 10

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" 
  xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">

  <xs:simpleType name="multipleOfTen">
    <xs:restriction base="xs:integer">
      <xs:pattern value=".*0" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

xs:pattern defines a pattern that must be matched by the lexical value of the datatype:

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
  elementFormDefault="qualified">
  <xsd:simpleType name="nonScientific">
    <xsd:restriction base="xsd:float">
      <xsd:pattern value="[^eE]*" />
    </xsd:restriction>
  </xsd:simpleType>
  <xsd:simpleType name="noLeading0">
    <xsd:restriction base="xsd:float">
      <xsd:pattern value="[^0].*" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>