google-search: Difference between revisions

Revision as of 16:27, 17 December 2012

<entry-title>Google Search</entry-title>

Google is one of several search-engines that index and support microformats.

main search

Google.com supports rel-nofollow, hCard, hReview, hReview aggregate, hProduct (since 2009-05-12 for rich snippets), hCalendar (since 2010-01-22), and hRecipe (since 2010-04-13) - in main search. See also related blog post on hCalendar hRecipe support.

rich snippets

Main article: rich-snippets

Rich Snippets is Google's term for the enhancement of search results ("snippets") with information from microformats from pages.

See google-rich-snippets-examples for documentation of Google's microformats examples.
See google-rich-snippets-issues for issues with Google's Rich Snippets Testing tool.

reviews

Google's documentation on Rich snippets - Reviews support describes details:

the main topic of the page needs to be about a specific product or service. For example, using review markup on a page containing multiple products is not supported.
If the markup contains a single review, the reviewer’s name needs to be a valid name (Person or Organization)
- presumably an hCard

hReview properties supported (bold = required)

item
- fn

rating

value

best

value-title support:

 <span class="best"><span class="value-title" title="10"/></span>

worst
"Tip: Don't add a separate hidden text block to specify the rating. Hidden content will not be displayed."[1]

img alt number parsing:

<img class="rating" src="four_star_rating.gif" alt="4 Star Rating: Recommended" />

value-title support:

<span class="rating"><span class="value-title" title="4.5" /></span>

reviewer
dtreviewed
description
summary

hReview-aggregate additional properties supported in addition to the above (or additional requirements / subproperties)

count - "The total number of reviews for the item on your site. Note: Whenever you include count, the page must also contain review markup for each reviewed item. count should only include reviews on your own site."
votes - "contributes toward the average rating but not towards the number of reviews available" - essentially, a "number of ratings" property.
rating - required in their hReview-aggregate support
rating
- average (additional subproperty)
photo - though presumably this works in hReviews as well

advanced search

Through additional user interfaces:

Google Advanced Search - Usage rights supports rel-license (since 2005(?) citation needed)

search APIs

Google provides search APIs like:

Google Social Graph API supports XFN (launched 2008 February). See "Google Social Graph API How are your sites connected?".

@@ Line 4: / Line 4: @@
 == main search ==
-[http://google.com/ Google.com] supports [[rel-nofollow]] (since 2005(?) citation needed) and as of 2009-05-12, [[hCard]], [[hReview]], [[hreview-aggregate|hReview aggregate]], [[hProduct]] in [http://www.google.com/support/webmasters/bin/answer.py?answer=99170 rich snippets] in search results.
+[http://google.com/ Google.com] supports [[rel-nofollow]], [[hCard]], [[hReview]], [[hreview-aggregate|hReview aggregate]], [[hProduct]] (since 2009-05-12 for [http://www.google.com/support/webmasters/bin/answer.py?answer=99170 rich snippets]), [[hCalendar]] ([http://googlewebmastercentral.blogspot.com/2010/01/introducing-new-rich-snippets-format.html since 2010-01-22]), and [[hRecipe]] ([http://googlewebmastercentral.blogspot.com/2010/04/better-recipes-on-web-introducing.html since 2010-04-13]) - in main search. See also [http://microformats.org/2010/04/28/google-adds-support-for-hcalendar-and-hrecipe-rich-snippets related blog post on hCalendar hRecipe support].
 === rich snippets ===
@@ Line 11: / Line 11: @@
 * See [[google-rich-snippets-examples]] for documentation of Google's microformats examples.
 * See [[google-rich-snippets-issues]] for issues with Google's Rich Snippets Testing tool.
+=== reviews ===
+Google's [http://support.google.com/webmasters/bin/answer.py?hl=en&answer=146645 documentation on Rich snippets - Reviews support] describes details:
+* the main topic of the page needs to be about '''a ''specific'' product or service'''. For example, using review markup on a page containing multiple products is not supported.
+* If the markup contains a single review, the '''reviewer’s name needs to be a valid name''' (Person or Organization)
+** presumably an [[hCard]]
+[[hReview]] properties supported ('''bold''' = required)
+* '''item'''
+** fn
+* rating
+** value
+** best
+*** value-title support: <source lang=html4strict> <span class="best"><span class="value-title" title="10"/></span> </source>
+** worst
+** "Tip: Don't add a separate hidden text block to specify the rating. '''Hidden content will not be displayed.'''"[http://support.google.com/webmasters/bin/answer.py?hl=en&answer=172705]
+** img alt number parsing: <source lang=html4strict><img class="rating" src="four_star_rating.gif" alt="4 Star Rating: Recommended" /></source>
+** value-title support: <source lang=html4strict><span class="rating"><span class="value-title" title="4.5" /></span></source>
+* '''reviewer'''
+* dtreviewed
+* description
+* summary
+[[hReview-aggregate]] additional properties supported in addition to the above (or additional requirements / subproperties)
+* count - "The total number of reviews for the item on your site. Note: Whenever you include count, the page must also contain review markup for each reviewed item. count should only include reviews on your own site."
+* votes - "contributes toward the average rating but not towards the number of reviews available" - essentially, a "number of ratings" property.
+* '''rating''' - required in their hReview-aggregate support
+* rating
+** average (additional subproperty)
+* photo - though presumably this works in hReviews as well
 == advanced search ==