XEP-0456: fix lack of algorithm description

xep-0456.xml

@@ -23,6 +23,12 @@
 <email>jonas@zombofant.net</email>
 <jid>jonas@zombofant.net</jid>
 </author>
+  <revision>
+    <version>0.2.0</version>
+    <date>2021-03-28</date>
+    <initials>jsc</initials>
+    <remark>Describe the conversion algorithm.</remark>
+  </revision>
   <revision>
     <version>0.1.0</version>
     <date>2021-03-28</date>
@@ -131,8 +137,9 @@ unexpected elements.</p>
 <section2 anchor="plain-text" topic="Plain-text compatibility">
 
 <p>If the format needs to be conveyed in plain text form, for example to carry
-the list of labels in &xep0128; or a &xep0004; configuration form, the
-following algorithm is to be applied:</p>
+the list of labels in &xep0128; or a &xep0004; configuration form, the structure described above is converted to a simple text-based form.</p>
+
+<p>Each <tt>&lt;simple-label/&gt;</tt> element is converted to a line of text. The line is composed of the value of the <tt>type</tt> attribute of the element, followed by a single space character (U+0020), followed by the character data of the element.</p>
 
 </section2></section1><section1 anchor="usecases" topic="Use Cases">
 
@@ -151,10 +158,7 @@ All labels are mapped to a single <tt>text-multi</tt>.</p>
     </field>
 </x>]]></example>
 
-<p>Each line in the <tt>text-multi</tt> field is prefixed with the <tt>key</tt> of the
-corresponding <tt>&lt;simple-label/&gt;</tt> element. The <tt>key</tt> is followed by a single
-space character (U+0020), followed by the character data of the
-<tt>&lt;simple-label/&gt;</tt> element.</p>
+<p>Each line in the <tt>text-multi</tt> field corresponds to a converted <tt>&lt;simple-label/&gt;</tt> element as described above.</p>
 
 </section2><section2 anchor="muc-config" topic="Offering configuration of the Self-Rating of a XEP-0045 Multi-User-Chat">