"Remember to update /var/db/xmlcatalog" message?

[gustaf]

For some time, I've been looking for the meaning of the "Remember to update /var/db/xmlcatalog" message that comes up after every upgrade. There doesn't seem to be any information anywhere about this message.

I just found the same question on the OpenBSD newbie mailing list and looked at the link in the post. This catalog has something to do with Gnome, but the page doesn't say anything about updating it.

Here is the entire contents of mine:

less /var/db/xmlcatalog

<?xml version="1.0"?>
<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"/>

Does anybody here know what this message means? Is it important? How does one go about updating this catalog?