--- |
  <?xml version="1.0" encoding="UTF-8"?>
  <schema xmlns="http://www.w3.org/2001/XMLSchema">
    <element name="foo" type="sometype"/>
    <simpleType name="sometype">
       <restriction base="decimal">
          <minExclusive value="-50"/>
       </restriction>
    </simpleType>
  </schema>

--- |
  <foo>-49</foo>
--- >
PASS

--- |
  <foo>-50</foo>
--- >
FAIL