diff --git a/mercurial/templates/map-cmdline.xml b/mercurial/templates/map-cmdline.xml
--- a/mercurial/templates/map-cmdline.xml
+++ b/mercurial/templates/map-cmdline.xml
@@ -3,6 +3,7 @@ footer = '</log>\n'
 
 changeset = '<logentry revision="{rev}" node="{node}">\n{branches}{tags}{parents}<author email="{author|email|xmlescape}">{author|person|xmlescape}</author>\n<date>{date|rfc3339date}</date>\n<msg xml:space="preserve">{desc|xmlescape}</msg>\n</logentry>\n'
 changeset_verbose = '<logentry revision="{rev}" node="{node}">\n{branches}{tags}{parents}<author email="{author|email|xmlescape}">{author|person|xmlescape}</author>\n<date>{date|rfc3339date}</date>\n<msg xml:space="preserve">{desc|xmlescape}</msg>\n<paths>\n{file_adds}{file_dels}{file_mods}</paths>\n{file_copies}</logentry>\n'
+changeset_debug = '<logentry revision="{rev}" node="{node}">\n{branches}{tags}{parents}<author email="{author|email|xmlescape}">{author|person|xmlescape}</author>\n<date>{date|rfc3339date}</date>\n<msg xml:space="preserve">{desc|xmlescape}</msg>\n<paths>\n{file_adds}{file_dels}{file_mods}</paths>\n{file_copies}{extras}</logentry>\n'
 
 file_add  = '<path action="A">{file_add|xmlescape}</path>\n'
 file_mod  = '<path action="M">{file_mod|xmlescape}</path>\n'
@@ -15,3 +16,4 @@ end_file_copies = '</copies>\n'
 parent = '<parent revision="{rev}" node="{node}" />\n'
 branch = '<branch>{branch|xmlescape}</branch>\n'
 tag = '<tag>{tag|xmlescape}</tag>\n'
+extra = '<extra key="{key|xmlescape}">{value|xmlescape}</extra>\n'