test/schemas/poschargrp0_0.xsd

<?xml version="1.0" encoding="utf-8" ?> 
<xs:schema targetNamespace="http://obj-sys.com/mySchema"
                  xmlns:elementFormDefault="qualified"
                  xmlns="http://obj-sys.com/mySchema"
                  xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="testElem">
    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:pattern value="[^.:/]+"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:element>
  
</xs:schema>