core spec: Replace broken link for interval notation
Fixes
@@ -5703,9 +5703,9 @@ URL(String protocol, String host, String file)</programlisting>
class="uri"><link
xlink:href="http://www.w3c.org/TR/REC-xml#sec-notation"/></biblioid></bibliomixed>
- <bibliomixed xml:id="i3024221"><title>Mathematical Convention for
- Interval Notation</title><biblioid class="uri"><link
- xlink:href="http://planetmath.org/encyclopedia/Interval.html"/></biblioid></bibliomixed>
+ <bibliomixed xml:id="i3024221"><title>Interval
+ (Mathematics)</title><biblioid class="uri"><link
+ xlink:href="https://en.wikipedia.org/wiki/Interval_(mathematics)"/></biblioid></bibliomixed>
<bibliomixed xml:id="i3086040"><title>RFC 2396 Uniform Resource
Identifiers URI: Generic Syntax</title><biblioid class="uri"><link
