XML/XML Schema/decimal

A decimal when lexical space is limited to "1" and "1.5,"

File: Data.xml
<?xml version="1.0"?>
<data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://www.wbex.ru Schema.xsd"
              xmlns="http://www.wbex.ru"
              >
   1    
</data>

File: Schema.xsd
<?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="data" type="myDecimal"/>
  
  <xs:simpleType name="myDecimal">
    <xs:restriction base="xs:decimal">
      <xs:pattern value="1" />
      <xs:pattern value="1\.5" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>