sitemap-ping.txt content formats?

[華韻國學教育]

Should it be that one url a line, or all urls in a line?
So , which is right below:

Code Select Expand

http://www.google.com/webmasters/tools/ping?sitemap=
http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=
http://submissions.ask.com/ping?sitemap=
http://api.moreover.com/ping?u=
http://webmaster.live.com/ping.aspx?siteMap=
http://www.bing.com/webmaster/ping.aspx?siteMap=

Code Select Expand

http://www.google.com/webmasters/tools/ping?sitemap=http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=http://submissions.ask.com/ping?sitemap=http://api.moreover.com/ping?u=http://webmaster.live.com/ping.aspx?siteMap=http://www.bing.com/webmaster/ping.aspx?siteMap=

[XML-Sitemaps Support]

One URL per line.