i have 2 vacation rentals property listing website . Both of this website are big with 1000 if pages. How can create Google XML site map of this lot of pages and submit it to webmaster central. also If i add new property then should i resubmit my site map to search engine every time i add new property in my website . please give me some suggestion
you can create the google sitemap from xml sitemap and resubmit sitemap at webmaster tool also, and you can add new property.
A sitemap can contain a maximum of 50,000 URL's. If your sites have more than this you will need to create multiple sitemaps for them. Your sitemap should at all times reflect the status of your site, so if a change is made to the site, the sitemap should be changed to reflect this, and then resubmitted to search engines.
I agree with archiew, except that you do not really have to re-submit to the search engines. You only have to make sure that the sitemap on your server is up to date and that the sitemap filename and location has not been changed. What is submitted to the serach engines is the URL of the sitemap and so if the sitemap's filename and location on the server has not been changed, the search engine boits will be able to see the changes in the sitemap even without re-submission.