code: @Nonnull
    public PSNS readNSFromXML (@Nonnull final IMicroElement eNS)
    {
      final PSNS ret = new PSNS ();
  
      eNS.forAllAttributes ( (sNS, sAttrName, sVal) -> {
        final String sAttrValue = _getAttributeValue (sVal);
        if (sAttrName.equals (CSchematronXML.ATTR_URI))
          ret.setUri (sAttrValue);
        else
          if (sAttrName.equals (CSchematronXML.ATTR_PREFIX))
            ret.setPrefix (sAttrValue);
          else
            ret.addForeignAttribute (sAttrName, sAttrValue);
      });
  
      eNS.forAllChildElements (eLetChild -> {
        if (CSchematron.NAMESPACE_SCHEMATRON.equals (eLetChild.getNamespaceURI ()))
        {
          _warn (ret, "Unsupported Schematron element '" + eLetChild.getLocalName () + "'");
        }
        else
          _warn (ret, "Unsupported namespace URI '" + eLetChild.getNamespaceURI () + "'");
      });
      return ret;
    }
docs: Read a &lt;ns&gt; element
  
  @param eNS
  The source micro element. Never <code>null</code>.
  @return The created domain object. May not be <code>null</code>.