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One important restriction of this approach is that such markup based on element inclusion must meet the well-formedness conditions. As these documents are broadly tree-structured, this means that only balanced fragments from a sub-tree can be marked up in this way. A means of marking-up any arbitrary
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specified three forms of structured metadata that their systems will use to find structured semantic content within webpages. Such information, when related to reviews, people profiles, business listings, and events will be used by Google to enhance the "snippet", or short piece of quoted text that
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In order for search-engine spiders to be able to rate the significance of pieces of text they find in HTML documents, and also for those creating mashups and other hybrids, as well as for more automated agents as they are developed, the semantic structures that exist in HTML need to be widely and
177:, every HTML document makes its contribution to the meaningfulness of the Web by the correct use of headings, lists, titles and other semantic markup wherever possible. This "plain" use of HTML has been called "Plain Old Semantic HTML" or POSH. The correct use of Web 2.0 'tagging' creates
124:, where it was presented that intelligent software 'agents' might one day automatically crawl the Web and find, filter and correlate previously unrelated, published facts for the benefit of end users. Such agents are not commonplace even now, but some of the ideas of
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HTML has included semantic markup since its inception. In an HTML document, the author may, among other things, "start with a title; add headings and paragraphs; add emphasis to text; add images; add links to other pages; use various kinds of lists".
288:). For example, when a screen reader or audio browser can correctly ascertain the structure of a document, it will not waste the visually impaired user's time by reading out repeated or irrelevant information when it has been marked up correctly.
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is to slowly introduce more ways for browsers, developers, and crawlers to better distinguish between different types of data, allowing for benefits such as better display on browsers on different devices.
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These class names are at best suggestive rather than formally meaningful, unless they are previously shared between both creator and consumer of the content.
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may be coming close. The main difference between these web application hybrids and
Berners-Lee's semantic agents lies in the fact that the current
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In cases where a document requires more precise semantics than those expressed in HTML alone, fragments of the document may be enclosed within
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or search-engine spider. These software agents are dependent on the semantic clarity of web pages they find as they use various techniques and
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were beginning to work in most browsers, web authors have been encouraged to avoid the use of presentational HTML markup with a view to the
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An important type of web agent that does crawl and read web pages automatically, without prior knowledge of what it might find, is the
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and hybridisation of information is usually designed in by web developers, who already know the web locations and the
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in HTML 4.01 and XHTML recommendations, but were recommended against. In HTML 5, some of those elements, such as
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is shown when the page appears in search listings. Google specifies that that data may be given using
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This article notes that presentational HTML markup may be useful when targeting browsers "before
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Weaving the Web: The
Original Design and Ultimate Destiny of the World Wide Web by Its Inventor
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section of HTML would require a mechanism independent of the markup structure itself, such as
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attributes added to existing HTML elements; microformat keywords are added inside
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to read and index millions of web pages a day and provide web users with
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within a schema or ontology, they may link to a more defined meaning.
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uniformly applied to bring out the meaning of published information.
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Shadbolt, Nigel; Berners-Lee, Tim; Hall, Wendy (May–June 2006).
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16:"Semantic markup" redirects here. For more general usage, see
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of the specific data they wish to mash, compare and combine.
101:(added in HTML 3.2). There are also the semantically neutral
648:. World Wide Web Consortium. Section 4.5.18: The b element.
634:. World Wide Web Consortium. Section 4.5.17: The i element.
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Berners-Lee, Tim; Hendler, James; Lassila, Ora (2001).
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HTML used to reinforce meaning of documents or webpages
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that may be equally or even more meaningful to many.
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Various versions of the HTML standard have included
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is used to suggest its presentation to human users.
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93:(added in HTML 3.2; removed in HTML 4.0 Strict),
269:formalise this approach to semantics in HTML.
20:. For semantics in programming languages, see
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253:elements with meaningful class names such as
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763:is an initiative launched on 2 June 2011 by
61:. Semantic HTML is processed by traditional
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225:Presentational elements were not formally
185:introduced new semantic elements such as
589:. microformats community. April 20, 2007
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414:CP/LD (Content Profile/Linked Document)
339:attributes added to existing elements.
1006:Knowledge representation and reasoning
940:Semantic service-oriented architecture
111:separation of content and presentation
18:separation of content and presentation
280:Good semantic HTML also improves the
261:. Where these class names are also a
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673:Extensible Markup Language (XML) 1.1
286:Web Content Accessibility Guidelines
120:participated in a discussion of the
105:elements. Since the late 1990s when
49:, or meaning, of the information in
521:" which were both released in 1997.
1067:Syntax and supporting technologies
691:"Conceitos importantes sobre HTML"
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259:<div class="db-aW52b2ljZQ">
57:rather than merely to define its
583:"Plain Old Semantic HTML (POSH)"
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349:
313:. Microdata is specified inside
255:<span class="db-YXV0aG9y">
34:HTML element content categories
499:Raggett, Dave (8 April 2002).
1:
1181:Schemas, ontologies and rules
610:"Let's Talk about Semantics"
558:"The Semantic Web Revisited"
399:Semantics (computer science)
22:Semantics (computer science)
669:"Well-Formed XML Documents"
503:. World Wide Web Consortium
475:"Getting started with HTML"
357:Computer programming portal
284:of web documents (see also
217:. Overall, the goal of the
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1208:Semantic Web Rule Language
563:. IEEE Intelligent Systems
441:; Fischetti, Mark (2000).
15:
501:"Adding a touch of style"
479:World Wide Web Consortium
449:. San Francisco: Harper.
134:price comparison websites
65:as well as by many other
1314:Microformat vocabularies
986:Information architecture
45:markup to reinforce the
1203:Rule Interchange Format
966:Collective intelligence
292:Google "rich snippets"
107:Cascading Style Sheets
35:
535:. Scientific American
519:Internet Explorer 4.0
87:presentational markup
33:
1001:Knowledge management
996:Knowledge extraction
59:presentation or look
1273:Common vocabularies
1227:Semantic annotation
925:Semantic publishing
263:fragment identifier
97:(all versions) and
1021:Digital humanities
910:Semantic computing
900:Semantic analytics
884:Rule-based systems
533:"The Semantic Web"
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1381:Web accessibility
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971:Description logic
930:Semantic reasoner
920:Semantic matching
848:Semantic networks
738:Webmaster Central
713:Webmaster Central
587:Microformats Wiki
473:(24 April 2005).
157:search facilities
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389:Semantic Web
384:Microformats
307:microformats
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215:<time>
211:<mark>
179:folksonomies
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122:Semantic Web
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103:span and div
91:<font>
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63:web browsers
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1285:Dublin Core
1011:Library 2.0
879:Linked data
203:<nav>
149:Web crawler
138:aggregation
67:user agents
1386:Web design
1365:Categories
1295:Schema.org
1031:References
981:Geotagging
976:Folksonomy
869:Dataspaces
862:Sub-topics
838:Ontologies
816:Background
761:schema.org
616:26 October
567:8 December
539:2009-10-02
507:8 December
484:8 December
426:References
227:deprecated
171:ontologies
153:algorithms
1326:hCalendar
1244:Microdata
1141:N-Triples
1134:Notation3
1060:Standards
1036:Topic map
874:Hyperdata
843:Semantics
828:Hypertext
823:Databases
303:microdata
296:In 2010,
235:<b>
231:<i>
116:In 2001,
95:<i>
51:web pages
47:semantics
1336:hProduct
1026:Metadata
833:Internet
343:See also
337:property
319:itemprop
315:itemtype
275:XPointer
175:metadata
89:such as
1346:hReview
1341:hRecipe
1113:JSON-LD
1106:RDF/XML
1099:triples
1041:Web 2.0
646:"HTML5"
632:"HTML5"
130:mashups
126:Web 2.0
77:History
1259:SAWSDL
1162:SPARQL
1120:Turtle
773:Yahoo!
769:Google
743:26 May
718:26 May
593:May 4,
453:
332:typeof
298:Google
213:, and
183:HTML 5
1331:hCard
1321:hAtom
1239:GRDDL
1218:SHACL
991:iXBRL
950:Solid
561:(PDF)
323:class
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1300:SIOC
1290:FOAF
1280:DOAP
1254:RDFa
1234:eRDF
1213:ALPS
1198:RDFS
1157:RRID
1148:TriX
1127:TriG
1074:HTTP
771:and
765:Bing
745:2010
720:2010
618:2015
595:2013
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517:and
509:2010
486:2010
451:ISBN
379:RDFa
335:and
317:and
311:RDFa
257:and
247:span
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173:and
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53:and
43:HTML
1193:OWL
1167:XML
1093:RDF
1085:URI
1079:IRI
677:W3C
404:XML
327:rel
309:or
251:div
249:or
219:W3C
168:RDF
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