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Changes between Initial Version and Version 1 of Ticket #20283, comment 1

initial	v1
1	1	For single posts it is possible to get canonical URL by used get_permalink() function or if we have paged post by used [http://core.trac.wordpress.org/ticket/16973 some function] that will be in future versions.
2	2
3		For any archive page there is no decision. It is possible to use get_pagenum_link() function in way like get_pagenum_link($wp_query->query_vars[ "paged" ]), but it is odd. If we have URL with unnecessary parameter like http://example.com/?cat=3&some_param=some_var (‘some_param’ is odd and unnecessary parameter) it makes parameter will be in every another page like http://example.com/?cat=3&some_param=some_var&page=2.
	3	For any archive page there is no decision. It is possible to use get_pagenum_link() function in way like get_pagenum_link($wp_query->query_vars[ "paged" ]), but it is odd. If we have URL with unnecessary parameter like http://example.com/?cat=3&some_param=some_var (‘some_param’ is odd and unnecessary parameter) it makes parameter will be in every another page like http://example.com/?cat=3&some_param=some_var&paged=2 for example.
4	4
5	5	Conclusion. Now we can retrieve canonical URL for single post (or single page or single attachment) only.