ht://Dig Email notification service

ht://Dig © 1995-1998 Andrew Scherpbier
Please see the file COPYING for license information.


As any HTML author knows, information is only useful if it is valid. Unfortunately, a lot of information has an inherent expiration date. Things like meeting schedules, announcements of upcoming events, and pages with those annoying yellow 'NEW' images by certain links.

ht://Dig is a WWW index/search system developed at San Diego State University. Since this index system already scans all HTML documents, it was the logical choice to incorporate a reminder service into it.

ht://Dig can be told to remind you about an HTML page sometime in the future. The reminder/notification will come by email and will contain the URL to the page plus some other information.


ht://Dig detects special use of the <META> tag in HTML documents. The <META> tags should go between <HEAD> and </HEAD> of an HTML document.


<META NAME="htdig-email" CONTENT="">
<META NAME="htdig-email-subject" CONTENT="Reminder to update a page">
<META NAME="htdig-notification-date" CONTENT="8/28/1995">
<TITLE>Someone's homepage.</TITLE>
Body of document

After 8/28/1995 will get a mail message which will look something like this:

From: ht://Dig email notification service
Subject: WWW notification: Reminder to update a page

The following page was tagged to notify you after 8/28/1995.

Date: 8/28/1995
Subject: Reminder to update a page


The special ht://Dig <META> tag attributes related to notification are:

Descriptions of the values for the attributes:

This is the email address the notification message should be sent to. Multiple email addresses can be given by separating them by commas. If no email address is given, no notification will be sent.
This is the date on or after which the notification should be sent. The format is simply month / day / year. Make sure that the year has the century with it as well. This means that you should use 1995 instead of 95.
If no date is given, no notification will be sent.
This specifies the subject the notification message. This is an optional attribute. Note that if you want to put spaces in the subject, you have to put double quotes (") around it.

There are a couple of other META attributes which are recognized. These can be found in the more general ht://Dig META tag documentation.


This service is a free service for all HTML maintainers whose documents are covered by the ht://Dig search system. If any of the attributes are improperly formatted, no notifications will be mailed. Email notification may not always occur on the date that you specified. We can only guarantee a notification of at most once a week.

Andrew Scherpbier <>
Last modified: Tue Oct 22 08:59:49 PDT