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RDFa vs Microdata

RDFa vs Microdata. The other report at link below uses property=" for RDFa but that is too general and doesn't always mean a RDFa property. http://blekko.com/webgrep?page=view&id=68cdb73f9dfd6efa53e31d82c5f396ca

grep pattern	Number of Urls	Number of Domains
typeof=" -RDFa 1.1 schema type declaration	54,093,479	93,771
itemtype= -Microdata schema type declaration	498,824,278	1,150,374

List of top 100 domains in rank order:

typeof="
(RDFa 1.1 schema type declaration)

URL	Site Rank
1. sourceforge.net	6,181
2. www.myspace.com	6,008
3. creativecommons.org	5,957
4. feeds.feedburner.com	5,273
5. www.bbc.co.uk	5,068
6. www.w3.org	4,725
7. github.com	4,682
8. www.guardian.co.uk	4,078
9. www.huffingtonpost.com	4,077
10. www.reuters.com	3,485
11. drupal.org	3,428
12. www.wired.com	3,179
13. www.ibm.com	3,070
14. www.msnbc.msn.com	2,955
15. www.un.org	2,896
16. www.tripadvisor.com	2,689
17. www.foxnews.com	2,686
18. www.cisco.com	2,590
19. www.ala.org	2,393
20. www.real.com	2,338
21. www.wix.com	2,320
22. www.ebay.com	2,266
23. www.fema.gov	2,262
24. www.hhs.gov	2,132
25. www.marketwatch.com	2,049
26. stackoverflow.com	2,037
27. www.dhs.gov	2,021
28. de.wikipedia.org	1,959
29. www.smh.com.au	1,911
30. www.eff.org	1,889
31. www.fao.org	1,887
32. www.stanford.edu	1,882
33. www.examiner.com	1,876
34. www.meetup.com	1,706
35. www.thedailybeast.com	1,681
36. www.indiana.edu	1,650
37. feeds2.feedburner.com	1,636
38. support.google.com	1,626
39. www.colorado.edu	1,584
40. www.regonline.com	1,575
41. thinkprogress.org	1,569
42. www.umich.edu	1,526
43. searchenginewatch.com	1,517
44. research.microsoft.com	1,514
45. www.theage.com.au	1,485
46. www.careerbuilder.com	1,481
47. www.gwu.edu	1,477
48. www.ready.gov	1,456
49. searchengineland.com	1,442
50. www.plosone.org	1,430
51. www.worldcat.org	1,428
52. oreilly.com	1,426
53. www.umass.edu	1,407
54. hosted.ap.org	1,399
55. www.thenation.com	1,385
56. depts.washington.edu	1,383
57. www.bestbuy.com	1,340
58. www.instructables.com	1,338
59. www.itu.int	1,337
60. today.msnbc.msn.com	1,321
61. faculty.washington.edu	1,319
62. www.alternet.org	1,300
63. cordis.europa.eu	1,296
64. bitbucket.org	1,294
65. tripadvisor.com	1,263
66. www.rottentomatoes.com	1,256
67. sxsw.com	1,229
68. sports.yahoo.com	1,226
69. energy.gov	1,225
70. www.ikea.com	1,214
71. www.heise.de	1,213
72. www.insidehighered.com	1,211
73. www.icann.org	1,192
74. zillow.com	1,186
75. www.tate.org.uk	1,186
76. www.nationalreview.com	1,181
77. www.mediabistro.com	1,170
78. www.seomoz.org	1,151
79. www.iraqcoalition.org	1,144
80. www.usaid.gov	1,144
81. www.britishcouncil.org	1,144
82. www.squidoo.com	1,138
83. store.steampowered.com	1,133
84. www.uky.edu	1,132
85. www.nal.usda.gov	1,104
86. www.commondreams.org	1,091
87. worldcat.org	1,082
88. www1.umn.edu	1,058
89. www.tripadvisor.co.uk	1,058
90. www.booking.com	1,054
91. www.hsph.harvard.edu	1,054
92. www.care2.com	1,051
93. movies.yahoo.com	1,050
94. onguardonline.gov	1,049
95. www.cato.org	1,048
96. www.gamespot.com	1,041
97. www.blurb.com	1,039
98. www.expedia.com	1,028
99. www.sierraclub.org	1,024
100. www.foxbusiness.com	1,009

itemtype=
(Microdata schema type declaration)

URL	Site Rank
1. twitter.com	18,695
2. www.facebook.com	15,687
3. www.youtube.com	13,956
4. maps.google.com	10,306
5. www.google.com	10,260
6. www.microsoft.com	10,213
7. en.wikipedia.org	8,933
8. www.flickr.com	8,834
9. www.linkedin.com	8,525
10. vimeo.com	8,006
11. www.amazon.com	7,773
12. www.addthis.com	7,117
13. google.com	6,965
14. bit.ly	6,604
15. wordpress.org	6,599
16. sourceforge.net	6,310
17. www.myspace.com	6,008
18. plus.google.com	5,861
19. docs.google.com	5,772
20. www.imdb.com	5,473
21. www.nytimes.com	5,353
22. feeds.feedburner.com	5,273
23. pinterest.com	5,205
24. sites.google.com	5,166
25. www.bbc.co.uk	5,068
26. www.paypal.com	4,911
27. validator.w3.org	4,746
28. www.w3.org	4,725
29. github.com	4,716
30. www.cnn.com	4,161
31. www.guardian.co.uk	4,078
32. www.huffingtonpost.com	4,077
33. soundcloud.com	4,045
34. www.washingtonpost.com	3,983
35. opengeodata.org	3,969
36. scottradcliff.com	3,969
37. tech.backtype.com	3,969
38. www.pbs.org	3,890
39. online.wsj.com	3,839
40. drupal.org	3,688
41. mashable.com	3,571
42. ec.europa.eu	3,511
43. www.ncbi.nlm.nih.gov	3,460
44. www.telegraph.co.uk	3,410
45. www.slideshare.net	3,384
46. code.google.com	3,284
47. groups.google.com	3,262
48. www.npr.org	3,255
49. abcnews.go.com	3,204
50. www.loc.gov	3,175
51. spreadsheets.google.com	3,130
52. books.google.com	3,012
53. www.ibm.com	3,001
54. www.scribd.com	2,972
55. www.msnbc.msn.com	2,955
56. groups.yahoo.com	2,922
57. apps.facebook.com	2,862
58. www.marriott.com	2,802
59. mail.google.com	2,769
60. www.latimes.com	2,722
61. www.tripadvisor.com	2,689
62. web.mit.edu	2,689
63. www.foxnews.com	2,686
64. nytimes.com	2,669
65. www.bbb.org	2,645
66. www.ustream.tv	2,633
67. gizmodo.com	2,595
68. slashdot.org	2,516
69. www.hp.com	2,418
70. msdn.microsoft.com	2,378
71. www.theatlantic.com	2,366
72. edition.cnn.com	2,356
73. www.blogger.com	2,349
74. www.chicagotribune.com	2,346
75. www.etsy.com	2,340
76. www.engadget.com	2,338
77. foursquare.com	2,338
78. www.wix.com	2,320
79. news.google.com	2,305
80. www.ebay.com	2,268
81. www.mysql.com	2,252
82. espn.go.com	2,250
83. www.barnesandnoble.com	2,221
84. www.sciencemag.org	2,206
85. addons.mozilla.org	2,201
86. www.ala.org	2,161
87. search.barnesandnoble.com	2,159
88. googleblog.blogspot.com	2,121
89. www.marketwatch.com	2,121
90. www.nydailynews.com	2,093
91. www.dailymotion.com	2,080
92. www.dell.com	2,079
93. lifehacker.com	2,068
94. www.reverbnation.com	2,064
95. web.me.com	2,039
96. stackoverflow.com	2,037
97. www.bizjournals.com	2,026
98. blogs.msdn.com	2,022
99. disney.go.com	2,019
100. de.wikipedia.org	2,007

for the complete list email sales@blekko.com

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RDFa vs Microdata