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

    <assert role="error" test="not(@nullFlavor and hl7:useablePeriod)" see="https://docs.art-decor.org/documentation/datatypes/DTr1_TEL"
        >dtr1-1-TEL: not null and useablePeriod</assert>
</rule>
