google-search: Difference between revisions

Revision as of 00:24, 19 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.

people

Google's documentation on Rich snippets - People support

Details:

at least two of the following must be present:
- title or role
- org
- adr

hCard properties supported (bold = required)

fn
nickname
photo
title
role
url
org - "If fn and org have the exact same value, Google will interpret the information as referring to a business or organization"
adr
- street-address
- locality
- region
- postal-code
- country-name
friend (presumably from xfn)
contact (presumably from xfn)
acquaintance (presumably from xfn)

reviews

Google's documentation on Rich snippets - Reviews support

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 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.
+=== people ===
+Google's [http://support.google.com/webmasters/bin/answer.py?hl=en&answer=146646 documentation on Rich snippets - People support]
+http://www.google.com//help/hc/images/webmasters_146676_rspeople.png
+Details:
+* at least two of the following must be present:
+** title or role
+** org
+** adr
+[[hCard]] properties supported ('''bold''' = required)
+* '''fn'''
+* nickname
+* photo
+* title
+* role
+* url
+* org - "If fn and org have the exact same value, Google will interpret the information as referring to a business or organization"
+* adr
+** street-address
+** locality
+** region
+** postal-code
+** country-name
+* friend (presumably from [[xfn]])
+* contact (presumably from [[xfn]])
+* acquaintance (presumably from [[xfn]])
 === reviews ===
-Google's [http://support.google.com/webmasters/bin/answer.py?hl=en&answer=146645 documentation on Rich snippets - Reviews support] describes details:
+Google's [http://support.google.com/webmasters/bin/answer.py?hl=en&answer=146645 documentation on Rich snippets - Reviews support]
+http://www.google.com/help/hc/images/webmasters_146645_individualimage.png
+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)