diff --git a/webapp/web/templates/freemarker/lib/lib-sequence.ftl b/webapp/web/templates/freemarker/lib/lib-sequence.ftl
new file mode 100644
index 000000000..6a9552b9c
--- /dev/null
+++ b/webapp/web/templates/freemarker/lib/lib-sequence.ftl
@@ -0,0 +1,14 @@
+<#-- $This file is distributed under the terms of the license in /doc/license.txt$ -->
+
+<#-- Macros for working with Freemarker sequences -->
+
+<#-- Macro join: join array elements with the specified glue string. -->
+
+<#macro join arr glue=", "><#compress>
+    <#assign count = 0>
+    <#-- This is VERY ugly: adding any formatting here inserts extra spaces into the output, even with the compress 
+    directive. The compress directive is also necessary, though. Seems counter to the documentation at
+    http://freemarker.org/docs/dgui_misc_whitespace.html -->
+    <#list arr as el><#if el?has_content><#if (count > 0)>${glue}</#if>${el}<#assign count = count+1></#if></#list>
+</#compress></#macro>
+