<?xml version="1.0" encoding="UTF-8"?>
<!-- 
    DTr1 TEL - Telecommunication Address
    Status: draft
-->
<rule xmlns="http://purl.oclc.org/dsdl/schematron"
      abstract="true"
      id="TEL.NL.EXTENDED">
    <extends rule="URL.NL.EXTENDED"/>

    <assert role="error" test="not(@nullFlavor and hl7:usablePeriod)">dtr1-1-TEL: not null and usablePeriod</assert>
</rule>
