The new <since> should be declared in common.dtd.

Otherwise, ir breaks  ./build.sh validate-xml

I forgot to push that in r1919560.

Thanks lucien Gentis for reporting it to me.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1919653 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/style/common.dtd

@@ -42,7 +42,7 @@
 <!-- Generic tag entities -->
 
 <!ENTITY % inlinetags "em | strong | code | a | br | directive | module |
-program | img | cite | q | dfn | var | transnote | glossary | phonetic">
+program | img | cite | q | dfn | var | transnote | glossary | phonetic | since">
 
 <!ENTITY % blocktags "p | example | note | table | ul | ol | dl | pre | 
 highlight | blockquote">
@@ -111,6 +111,8 @@ highlight | blockquote">
 
 <!ELEMENT var %Inline;>
 
+<!ELEMENT since %Inline;>
+
 <!-- translators note -->
 <!ELEMENT transnote %Inline;>