[bloggerDev] Obtaining ALL entry URLs

hi. I am trying to obtain URLs of ALL blog entries using Ruby.
But Ruby itself does not seem important here, though the code is given
below.

The feed URL of a blog looks like...

http://soichi-memos.blogspot.com/feeds/posts/default

or

http://www.blogger.com/feeds/8431963099352886303/posts/default

but the attempt to get URLs of entries gives only a portion of the
entire blog. (in this case only 25 of them)
Accessing these feed URLs gives XMLs containing only 25 entries, so I
am guessing that the problem is the setting of Blogger...?
But I am not sure.

Could anyone help me obtain ALL URLs of the blog?

#-------Ruby code starts here-----------------------------
require "rubygems"
require "open-uri"
require "nokogiri"

blog_feed = 'http://soichi-memos.blogspot.com/feeds/posts/default'

file = "list_url.txt"
filename = File.open(file, "w")

xml = Nokogiri::XML(open(blog_feed))

xml.search("link").each do |tag|
if tag.get_attribute("rel") == "alternate" then
url = tag.get_attribute('href')
filename.write(url)
filename.write("\n")
end
end

filename.close
#-------------Ruby code ends here
---------------------------------------

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