Luminate CMS: Add a list of categories as URL parameters

category-url-parameters.html

<t:if test="topic.length > 0">
	<t:list id="topic">
		<t:if test="index == 1">
			<t:set id="tops" value="concat(tops, '?topics=')" />
			<t:set id="tops" value="concat(tops, name)" />
		</t:if>
		<t:else>
			<t:set id="tops" value="concat(tops, '&topics=')" />
			<t:set id="tops" value="concat(tops, name)" />
		</t:else>
	</t:list>
</t:if>
<a href="index.html?${tops}">See similar articles</a>