Knowledge

Microdata (HTML)

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can extract and process Microdata from a web page and use it to provide a richer browsing experience for users. Search engines benefit greatly from direct access to Microdata because it allows them to understand the information on web pages and provide more relevant
509:– Indicates that its containing tag holds the value of the specified item property. The property's name and value context are described by the item's vocabulary. Properties values usually consist of string values, but can also use URLs using the 361:
specification, its development was terminated with a 'Note'. However, since that time, two new editors were selected, and five newer versions of the working draft have been published, the most recent being Working Draft 26 April 2018.
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For some purposes, an ad-hoc vocabulary is adequate. For others, a vocabulary will need to be designed. Where possible, authors are encouraged to re-use existing vocabularies, as this makes content re-use easier.
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problems between the Cyrillic and Latin alphabets. After the implementation of additional parameters from Schema's vocabulary, indexation of information in Russian-language web-pages became more successful.
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name = John Doe jobTitle = graduate research assistant affiliation = University of Dreams additionalName = Johnny url = http://www.example.com/~JohnnyD address = Item(1) Item 1 Type:
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to users. Microdata uses a supporting vocabulary to describe an item and name-value pairs to assign values to its properties. Microdata is an attempt to provide a simpler way of annotating
374:, or meaning of an Item. Web developers can design a custom vocabulary or use vocabularies available on the web. A collection of commonly used markup vocabularies are provided by 1655: 1111: 1634: 571:
Hello, my name is John Doe, I am a graduate research assistant at the University of Dreams. My friends call me Johnny. You can visit my homepage at
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The following text shows how Google parses the Microdata from the above example code. Developers can test pages containing Microdata using Google's
141: 470:(product data) and provides its own format for definition of the terms and encyclopedic articles. This extension was made in order to solve 2200: 1171: 267: 1576: 1906: 1840: 1700: 1979: 1354: 2205: 1850: 1022:. Opera supported it from 11.60 (released in 2011), but since removed its implementation. Firefox removed it in version 49. 446:
In some cases, search engines covering specific regions may provide locally-specific extensions of microdata. For example,
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The same machine-readable terms can be used not only in HTML Microdata, but also in other annotations such as
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The following HTML5 markup may be found on a typical “About” page containing information about a person:
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attribute can be associated with the item using this attribute. Provides a list of element IDs (not
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In 2013, because the W3C HTML Working Group failed to find someone to serve as an editor for the
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streetAddress = 1234 Peach Drive addressLocality = Warner Robins addressRegion = Georgia
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As the above example shows, Microdata items can be nested. In this case, an item of type
1628: 1461: 1316: 1921: 1810: 1800: 291: 180: 1601: 2164: 1951: 1871: 1830: 1820: 1784: 1580: 1350: 1290: 1261: 1237: 1213: 1748: 146: 497:– A valid URL of a vocabulary that describes the item and its properties' context. 2020: 1999: 1946: 1916: 1835: 1815: 1805: 988: 471: 107: 48: 1753: 1144: 326: 251: 114: 58: 1504: 2265: 2072: 2027: 1845: 1057: 284: 153: 119: 102: 2134: 2088: 1709: 1032: 488: 451: 343: 330: 97: 92: 87: 38: 1112:"MicroData - The Future of Search Engine Relevance and Optimization (SEO)" 2185: 2149: 1911: 1779: 1037: 418:. The website schema.org was established by search engine operators like 351: 334: 246: 241: 131: 75: 1391: 1015:
Browsers: As of July 2021, no major browser supports the Microdata
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attribute, or other elements that link to or embed external resources.
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with machine-readable tags than the similar approaches of using
2159: 2062: 1678: 1001: 447: 431: 427: 419: 315: 236: 212: 531:– Properties that are not descendants of the element with the 2231: 2221: 2139: 2118: 1891: 1052: 455: 217: 207: 202: 195: 70: 43: 2190: 2180: 2154: 1974: 1214:"HTML Microdata W3C First Public Working Draft 04 May 2017" 968: 956: 941: 347: 318: 29: 487:– Creates the Item and indicates that descendants of this 2067: 1647: 1502: 1019: 173: 539:
s) with additional properties elsewhere in the document.
434:, which use microdata markup to improve search results. 1145:""Distributed," "Extensibility," And Other Fancy Words" 1132: 600:. I live at 1234 Peach Drive, Warner Robins, Georgia. 1167:"WG Decision to publish HTML Microdata as a WG Note" 1321:Web Hypertext Application Technology Working Group 1291:"HTML Microdata W3C Working Draft 10 October 2017" 1262:"HTML Microdata W3C Working Draft 09 October 2017" 1657:Hixie discusses the addition of HTML5 "microdata" 2263: 1575:Opera Software Documentation Team (2011-12-06). 1462:"Rich snippets (microdata, microformats, RDFa)" 1238:"HTML Microdata W3C Working Draft 26 June 2017" 1008:. It was the preferred snippet format for the 1694: 545:– Indicates date or duration as specified by 292: 503:– Indicates a unique identifier of the item. 450:, a major search engine in Russia, supports 1456: 1454: 1363: 822:"http://schema.org/PostalAddress" 772:"http://www.example.com/~JohnnyD" 585:"http://www.example.com/~JohnnyD" 1701: 1687: 370:Microdata vocabularies do not provide the 299: 285: 1475: 1340: 1503:Google Webmasters Channel (2011-12-06). 1451: 1085: 1083: 1081: 1079: 1077: 1053:CP/LD (Content Profile/Linked Document) 16:Specification for metadata in web pages 2264: 1907:Knowledge representation and reasoning 1841:Semantic service-oriented architecture 1653: 1371:"Semantic markup deployment in Russia" 1164: 325:within existing content on web pages. 1682: 1643:W3C HTML Microdata Working Group Note 1630:Microdata — HTML Draft Standard 1285: 1283: 1074: 1602:"909633 - Remove HTML Microdata API" 1552:"Microdata DOM API - Web APIs | MDN" 1483:"Rich Snippet display clarification" 637:"http://schema.org/Person" 478: 1577:"Opera 11.60 for Windows changelog" 1137: 758:. You can visit my homepage at 613:Here is the same markup with added 13: 1968:Syntax and supporting technologies 1280: 14: 2288: 1621: 1091:"Microdata — HTML Draft Standard" 975:in the markup, or in an external 940:is nested inside an item of type 1708: 979:file in a serialization such as 1594: 1568: 1544: 1513:from the original on 2021-12-15 1496: 1434:"Schema.org Turtle RDFS Schema" 1426: 1405: 1384: 1334: 1309: 1295:World Wide Web Consortium (W3C) 1266:World Wide Web Consortium (W3C) 1242:World Wide Web Consortium (W3C) 1218:World Wide Web Consortium (W3C) 961:http://schema.org/PostalAddress 938:http://schema.org/PostalAddress 458:(company contact information), 441: 365: 1254: 1230: 1206: 1185: 1158: 1125: 1104: 1: 2082:Schemas, ontologies and rules 1068: 491:contain information about it. 273:Comparison of browser engines 7: 1654:Almaer, Dion (2009-05-11), 1579:. Opera.com. Archived from 1341:MacDonald, Matthew (2014). 1165:Cotton, Paul (2 Oct 2013). 1026: 870:"addressLocality" 690:graduate research assistant 321:specification used to nest 10: 2293: 2277:Search engine optimization 2109:Semantic Web Rule Language 994: 743:"additionalName" 553: 21:Microdata (disambiguation) 18: 2214: 2173: 2127: 2081: 1967: 1960: 1859: 1793: 1762: 1716: 1660:, Ajaxian, archived from 1343:HTML5: The missing manual 1004:can use microdata in its 949:Rich Snippet Testing Tool 899:"addressRegion" 841:"streetAddress" 729:. My friends call me 268:Document markup languages 2215:Microformat vocabularies 1887:Information architecture 1464:. Google Inc. 2016-05-17 957:http://schema.org/Person 942:http://schema.org/Person 786:www.example.com/~JohnnyD 619: 590:www.example.com/~JohnnyD 560: 2104:Rule Interchange Format 1867:Collective intelligence 1347:O'Reilly and Associates 1063:Semantic social network 714:"affiliation" 378:schemas which include: 1506:Types of Rich Snippets 1195:. W3.org. 23 June 2014 1674:, Data-Vocabulary.org 1671:HTML5 Microdata Specs 1556:developer.mozilla.org 466:(market reviews) and 159:Document Object Model 1902:Knowledge management 1897:Knowledge extraction 1606:bugzilla.mozilla.org 1147:. Diveintohtml5.info 719:University of Dreams 685:"jobTitle" 642:Hello, my name is 164:Browser Object Model 19:For other uses, see 2174:Common vocabularies 2128:Semantic annotation 1826:Semantic publishing 810:"address" 137:Character encodings 1922:Digital humanities 1811:Semantic computing 1801:Semantic analytics 1785:Rule-based systems 1536:has generic name ( 1133:http://schema.org/ 2259: 2258: 2255: 2254: 2165:Facebook Platform 2052: 2051:(no W3C standard) 2044: 2037: 2030: 2023: 2016: 2009: 2002: 1988: 1952:Web Science Trust 1872:Description logic 1831:Semantic reasoner 1821:Semantic matching 1749:Semantic networks 1356:978-1-4493-6326-0 1297:. 10 October 2017 479:Global attributes 309: 308: 2284: 2047: 2040: 2033: 2026: 2019: 2012: 2005: 1998: 1984: 1965: 1964: 1703: 1696: 1689: 1680: 1679: 1675: 1665: 1650: 1637: 1616: 1615: 1613: 1612: 1598: 1592: 1591: 1589: 1588: 1572: 1566: 1565: 1563: 1562: 1548: 1542: 1541: 1535: 1531: 1529: 1521: 1519: 1518: 1500: 1494: 1493: 1491: 1490: 1479: 1473: 1472: 1470: 1469: 1458: 1449: 1448: 1446: 1445: 1436:. Archived from 1430: 1424: 1423: 1421: 1420: 1413:"Type Hierarchy" 1409: 1403: 1402: 1400: 1399: 1388: 1382: 1381: 1379: 1378: 1367: 1361: 1360: 1345:(2nd ed.). 1338: 1332: 1331: 1329: 1327: 1313: 1307: 1306: 1304: 1302: 1287: 1278: 1277: 1275: 1273: 1268:. 9 October 2017 1258: 1252: 1251: 1249: 1248: 1234: 1228: 1227: 1225: 1224: 1210: 1204: 1203: 1201: 1200: 1193:"HTML Microdata" 1189: 1183: 1182: 1180: 1179: 1162: 1156: 1155: 1153: 1152: 1141: 1135: 1129: 1123: 1122: 1120: 1119: 1108: 1102: 1101: 1099: 1098: 1087: 932: 929: 926: 923: 920: 917: 913: 910: 907: 903: 900: 897: 894: 891: 888: 884: 881: 878: 874: 871: 868: 865: 862: 859: 855: 852: 849: 846:1234 Peach Drive 845: 842: 839: 836: 833: 830: 826: 823: 820: 817: 814: 811: 808: 805: 802: 799: 795: 792: 789: 785: 782: 779: 776: 773: 770: 767: 764: 761: 757: 754: 751: 747: 744: 741: 738: 735: 732: 728: 725: 722: 718: 715: 712: 709: 706: 703: 699: 696: 693: 689: 686: 683: 680: 677: 674: 670: 667: 664: 660: 657: 656:"name" 654: 651: 648: 645: 641: 638: 635: 632: 629: 626: 623: 609: 606: 603: 599: 596: 593: 589: 586: 583: 580: 577: 574: 570: 567: 564: 544: 538: 534: 530: 524: 521:element and its 520: 516: 513:element and its 512: 508: 502: 496: 486: 404:Review-aggregate 301: 294: 287: 252:Rendering engine 142:named characters 26: 25: 2292: 2291: 2287: 2286: 2285: 2283: 2282: 2281: 2262: 2261: 2260: 2251: 2210: 2169: 2123: 2077: 1956: 1947:Web engineering 1917:Digital library 1855: 1836:Semantic search 1816:Semantic mapper 1806:Semantic broker 1789: 1758: 1712: 1707: 1668: 1640: 1627: 1624: 1619: 1610: 1608: 1600: 1599: 1595: 1586: 1584: 1573: 1569: 1560: 1558: 1550: 1549: 1545: 1533: 1532: 1523: 1522: 1516: 1514: 1501: 1497: 1488: 1486: 1481: 1480: 1476: 1467: 1465: 1460: 1459: 1452: 1443: 1441: 1432: 1431: 1427: 1418: 1416: 1411: 1410: 1406: 1397: 1395: 1392:"Documentation" 1390: 1389: 1385: 1376: 1374: 1369: 1368: 1364: 1357: 1339: 1335: 1325: 1323: 1317:"HTML Standard" 1315: 1314: 1310: 1300: 1298: 1289: 1288: 1281: 1271: 1269: 1260: 1259: 1255: 1246: 1244: 1236: 1235: 1231: 1222: 1220: 1212: 1211: 1207: 1198: 1196: 1191: 1190: 1186: 1177: 1175: 1163: 1159: 1150: 1148: 1143: 1142: 1138: 1130: 1126: 1117: 1115: 1110: 1109: 1105: 1096: 1094: 1089: 1088: 1075: 1071: 1029: 1012:social network. 997: 965: 964: 934: 933: 930: 927: 924: 921: 918: 915: 911: 908: 905: 901: 898: 895: 892: 889: 886: 882: 879: 876: 872: 869: 866: 863: 860: 857: 853: 850: 847: 843: 840: 837: 834: 831: 828: 824: 821: 818: 815: 812: 809: 806: 803: 800: 797: 793: 790: 787: 783: 781:"url" 780: 777: 774: 771: 768: 765: 762: 759: 755: 752: 749: 745: 742: 739: 736: 733: 730: 726: 723: 720: 716: 713: 710: 707: 704: 701: 697: 694: 691: 687: 684: 681: 678: 675: 672: 668: 665: 662: 658: 655: 652: 649: 646: 643: 639: 636: 633: 630: 627: 624: 621: 611: 610: 607: 604: 601: 597: 594: 591: 587: 584: 581: 578: 575: 572: 568: 565: 562: 556: 542: 536: 532: 528: 522: 518: 517:attribute, the 514: 510: 506: 500: 494: 484: 481: 472:transliteration 462:(food recipe), 444: 416:Offer-aggregate 368: 305: 24: 17: 12: 11: 5: 2290: 2280: 2279: 2274: 2257: 2256: 2253: 2252: 2250: 2249: 2244: 2239: 2234: 2229: 2224: 2218: 2216: 2212: 2211: 2209: 2208: 2203: 2198: 2193: 2188: 2183: 2177: 2175: 2171: 2170: 2168: 2167: 2162: 2157: 2152: 2147: 2142: 2137: 2131: 2129: 2125: 2124: 2122: 2121: 2116: 2111: 2106: 2101: 2096: 2091: 2085: 2083: 2079: 2078: 2076: 2075: 2070: 2065: 2060: 2055: 2054: 2053: 2045: 2038: 2031: 2024: 2017: 2010: 2003: 1991: 1990: 1989: 1977: 1971: 1969: 1962: 1958: 1957: 1955: 1954: 1949: 1944: 1939: 1934: 1929: 1924: 1919: 1914: 1909: 1904: 1899: 1894: 1889: 1884: 1879: 1874: 1869: 1863: 1861: 1860:Related topics 1857: 1856: 1854: 1853: 1848: 1843: 1838: 1833: 1828: 1823: 1818: 1813: 1808: 1803: 1797: 1795: 1791: 1790: 1788: 1787: 1782: 1777: 1772: 1766: 1764: 1760: 1759: 1757: 1756: 1754:World Wide Web 1751: 1746: 1741: 1736: 1731: 1726: 1720: 1718: 1714: 1713: 1706: 1705: 1698: 1691: 1683: 1677: 1676: 1666: 1651: 1638: 1623: 1622:External links 1620: 1618: 1617: 1593: 1567: 1543: 1495: 1474: 1450: 1425: 1404: 1383: 1373:. Academia.edu 1362: 1355: 1333: 1308: 1279: 1253: 1229: 1205: 1184: 1174:(Mailing list) 1157: 1136: 1124: 1103: 1072: 1070: 1067: 1066: 1065: 1060: 1055: 1050: 1045: 1040: 1035: 1028: 1025: 1024: 1023: 1013: 996: 993: 955:Item Type: 954: 953: 620: 561: 555: 552: 551: 550: 540: 526: 504: 498: 492: 480: 477: 443: 440: 367: 364: 359:Microdata HTML 327:Search engines 307: 306: 304: 303: 296: 289: 281: 278: 277: 276: 275: 270: 262: 261: 257: 256: 255: 254: 249: 244: 239: 234: 233: 232: 222: 221: 220: 215: 210: 200: 199: 198: 188: 183: 178: 177: 176: 166: 161: 156: 151: 150: 149: 144: 134: 129: 124: 123: 122: 115:HTML attribute 112: 111: 110: 105: 100: 95: 85: 84: 83: 81:Mobile Profile 78: 68: 67: 66: 61: 56: 51: 41: 33: 32: 15: 9: 6: 4: 3: 2: 2289: 2278: 2275: 2273: 2272:Semantic HTML 2270: 2269: 2267: 2248: 2245: 2243: 2240: 2238: 2235: 2233: 2230: 2228: 2225: 2223: 2220: 2219: 2217: 2213: 2207: 2204: 2202: 2199: 2197: 2194: 2192: 2189: 2187: 2184: 2182: 2179: 2178: 2176: 2172: 2166: 2163: 2161: 2158: 2156: 2153: 2151: 2148: 2146: 2143: 2141: 2138: 2136: 2133: 2132: 2130: 2126: 2120: 2117: 2115: 2112: 2110: 2107: 2105: 2102: 2100: 2097: 2095: 2092: 2090: 2087: 2086: 2084: 2080: 2074: 2073:Semantic HTML 2071: 2069: 2066: 2064: 2061: 2059: 2056: 2050: 2046: 2043: 2039: 2036: 2032: 2029: 2025: 2022: 2018: 2015: 2011: 2008: 2004: 2001: 1997: 1996: 1995: 1992: 1987: 1983: 1982: 1981: 1978: 1976: 1973: 1972: 1970: 1966: 1963: 1959: 1953: 1950: 1948: 1945: 1943: 1940: 1938: 1935: 1933: 1930: 1928: 1925: 1923: 1920: 1918: 1915: 1913: 1910: 1908: 1905: 1903: 1900: 1898: 1895: 1893: 1890: 1888: 1885: 1883: 1880: 1878: 1875: 1873: 1870: 1868: 1865: 1864: 1862: 1858: 1852: 1849: 1847: 1846:Semantic wiki 1844: 1842: 1839: 1837: 1834: 1832: 1829: 1827: 1824: 1822: 1819: 1817: 1814: 1812: 1809: 1807: 1804: 1802: 1799: 1798: 1796: 1792: 1786: 1783: 1781: 1778: 1776: 1773: 1771: 1768: 1767: 1765: 1761: 1755: 1752: 1750: 1747: 1745: 1742: 1740: 1737: 1735: 1732: 1730: 1727: 1725: 1722: 1721: 1719: 1715: 1711: 1704: 1699: 1697: 1692: 1690: 1685: 1684: 1681: 1673: 1672: 1667: 1664:on 2009-12-12 1663: 1659: 1658: 1652: 1649: 1645: 1644: 1639: 1636: 1632: 1631: 1626: 1625: 1607: 1603: 1597: 1583:on 2014-10-23 1582: 1578: 1571: 1557: 1553: 1547: 1539: 1534:|author= 1527: 1526:cite AV media 1512: 1508: 1507: 1499: 1484: 1478: 1463: 1457: 1455: 1440:on 2014-09-21 1439: 1435: 1429: 1414: 1408: 1393: 1387: 1372: 1366: 1358: 1352: 1348: 1344: 1337: 1322: 1318: 1312: 1296: 1292: 1286: 1284: 1267: 1263: 1257: 1243: 1239: 1233: 1219: 1215: 1209: 1194: 1188: 1173: 1172: 1168: 1161: 1146: 1140: 1134: 1128: 1113: 1107: 1092: 1086: 1084: 1082: 1080: 1078: 1073: 1064: 1061: 1059: 1058:Semantic HTML 1056: 1054: 1051: 1049: 1046: 1044: 1041: 1039: 1036: 1034: 1031: 1030: 1021: 1018: 1014: 1011: 1007: 1003: 999: 998: 992: 990: 986: 982: 978: 974: 970: 962: 958: 952: 950: 945: 943: 939: 875:Warner Robins 827:I live at 671:, I am a 618: 616: 559: 548: 541: 527: 505: 499: 493: 490: 483: 482: 476: 473: 469: 465: 461: 457: 453: 449: 439: 435: 433: 429: 425: 421: 417: 413: 409: 405: 401: 397: 393: 389: 385: 381: 377: 373: 363: 360: 355: 353: 349: 345: 344:HTML elements 341: 336: 332: 328: 324: 320: 317: 313: 302: 297: 295: 290: 288: 283: 282: 280: 279: 274: 271: 269: 266: 265: 264: 263: 259: 258: 253: 250: 248: 245: 243: 240: 238: 235: 231: 228: 227: 226: 223: 219: 216: 214: 211: 209: 206: 205: 204: 201: 197: 194: 193: 192: 189: 187: 184: 182: 179: 175: 172: 171: 170: 167: 165: 162: 160: 157: 155: 154:Language code 152: 148: 145: 143: 140: 139: 138: 135: 133: 130: 128: 125: 121: 120:alt attribute 118: 117: 116: 113: 109: 106: 104: 101: 99: 96: 94: 91: 90: 89: 86: 82: 79: 77: 74: 73: 72: 69: 65: 62: 60: 57: 55: 52: 50: 47: 46: 45: 42: 40: 37: 36: 35: 34: 31: 28: 27: 22: 2150:Microformats 2144: 2089:Common Logic 1794:Applications 1710:Semantic Web 1670: 1662:the original 1656: 1642: 1629: 1609:. 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Index

Microdata (disambiguation)
HTML
Dynamic HTML
HTML5
article
audio
canvas
video
XHTML
Basic
Mobile Profile
HTML element
meta
div and span
blink
marquee
HTML attribute
alt attribute
HTML frame
HTML editor
Character encodings
named characters
Unicode
Language code
Document Object Model
Browser Object Model
Style sheets
CSS
Font family
Web colors

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