XML/XML Schema/minLength

xs:minLength defines a minimum length measured in number of characters or bytes (hexBinary and base64Binary):

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"
              >

 asdfasdf
</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="longName"/>
  <xs:simpleType name="longName">
    <xs:restriction base="xs:NCName">
      <xs:minLength value="6" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>