Zenphoto version 1.4.0.4 [7122] (Official Build)
Current locale setting: en_US.UTF8
Plugin : sitemap-extended v1.4.0

When I submit sitemap to Google Webmaster tool by using following URL:

http://www.hkceleb.com/pic/index.php?sitemap

It' return following error:

Sitemap is HTML
Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead.

I try validate the sitemap file:

http://www.w3.org/2001/03/webdata/xsv?docAddrs=http://www.hkceleb.com/pic/index.php?sitemap&style=xsl

It return:

Attempt to load a schema document from http://www.w3.org/1999/xhtml (source: docElt) for http://www.w3.org/1999/xhtml, failed:

Not recognised as W3C XML Schema or RDDL: html

It pass sitemap generate by Wordpress :

http://www.w3.org/2001/03/webdata/xsv?docAddrs=http://www.hkceleb.com/sitemap.xml&style=xsl

It is something wrong which generated sitemap file?

Regards,
Chris

If I visit your site and call the sitemap the index page appears. That is a bug in the 1.4.0.4 sitemap plugin if I recall right that long has been fixed in development.

The sitemap has been reworked quite a bit for the coming 1.4.1 release which can be previewed by installing the trunk nightly build (it does not generate automatically anymore on calling!).

acrylian, try use Google Chrome, it show HTML page

http://www.hkceleb.com/pic/index.php?sitemap

As I said this is a bug that calls the index page of your site which is of course a html page... So the fix is to try the trunk nightly build (which our own site uses right now) or wait until Zenphoto 1.4.1 is out.