XML Tutorial/XML Schema/decimal

The decimal data type represents a finite-length sequence of digits separated by a period.

<!-- schema -->
<xsd:element name="money">
  <xsd:simpleType>
   <xsd:restriction base="xsd:decimal">
    <xsd:totalDigits value="4"/>
    <xsd:fractionDigits value="2"/>
   </xsd:restriction>
  </xsd:simpleType>
</xsd:element>
<!-- instance document -->
<money>14.98</money>

Use decimal

File: Schema.xml
<?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:element name="population" type="xs:decimal" />
</xs:schema>

File: Data.xml
<?xml version="1.0"?>
<population xmlns="http://www.wbex.ru">34.2</population>