code: public XcapResponse deleteIfMatch(URI uri, String eTag,
  			Header[] additionalRequestHeaders, Credentials credentials)
  			throws IOException {
  
  		if (log.isDebugEnabled()) {
  			log.debug("deleteIfMatch(uri=" + uri + ", eTag=" + eTag
  					+ " , additionalRequestHeaders = ( "
  					+ Arrays.toString(additionalRequestHeaders) + " ) )");
  		}
  
  		final HttpDelete request = new HttpDelete(uri);
  		request.setHeader(XcapConstant.HEADER_IF_MATCH, eTag);
  		return execute(request, additionalRequestHeaders, credentials);
  	}
docs: /*
  (non-Javadoc)
  
  @see XcapClient#deleteIfMatch(java.net.URI,
  java.lang.String, Header[],
  Credentials)