Schema.org是一项社区协作活动，其使命是“创建、维护和促进Iteret、网页、电子邮件消息等互联网应用的结构化数据的词汇表”，旨在帮助实现“语义网”的长期愿景。网站管理员使用此共享词汇表来构建其网站上的元数据，并帮助搜索引擎理解已发布的内容，这种技术称为搜索引擎优化。
Schema.org词汇表由Google,Microsoft,Yahoo 和Yadex共同创建，因此包括Google,Big,Yahoo!和Yadex在内的搜索引擎都会依据这些标记来优化搜索结果，让人们更容易找到正确的网页。
Schema.org基于 RDF，有许多针对RDF的语法格式。后来开发者实现了在HTML中表示RDF，因此为了提供灵活性，Schema.org支持3种不同的表示选项：Microdata、RDFaLite和JSON-LD。
示例RDFa<maivocab="https://schema.org/"typeof="Orgaizatio"><h1property="ame">GeoBookClub</h1><divproperty="member"typeof="Perso"resource="ag">Foudigmember<spaproperty="ame">AliceNg</spa>welcomesyou!</div><divproperty="evet"typeof="Evet"resource="GBC_mtg_2">Pleasejoiusforourextmeetigwhereweshalldiscusstheovel<spaproperty="about"typeof="Book"><uproperty="ame">ThigsFallApart</u>by<aproperty="author"typeof="Perso"href="https://ewp.org/Chiua_Achebe"><spaproperty="ame">ChiuaAchebe</spa></a>(ISBN:<spaproperty="isb">9780393932195</spa>)</spa><imgproperty="image"src="TFA_cover.jpg"></div>Wehopeyou'vebeeabletoattedourpastmeetigs<ul><liproperty="evet"typeof="Evet"resource="GBC_mtg_1">…</li></ul></mai>Microdata<maiitemscopeitemtype="https://schema.org/Orgaizatio"><h1itemprop="ame">GeoBookClub</h1><divitemscopeitemprop="member"itemtype="https://schema.org/Perso"id="ag">Foudigmember<spaitemprop="ame">AliceNg</spa>welcomesyou!</div> <divitemprop="evet"itemscopeitemtype="https://schema.org/Evet"id="GBC_mtg_2"> Pleasejoiusforourextmeetigwhereweshalldiscusstheovel <spaitemprop="about"itemscopeitemtype="https://schema.org/Book"> <uitemprop="ame">ThigsFallApart</u>by <aitemprop="author"itemscopeitemtype="https://schema.org/Perso"href="https://ewp.org/Chiua_Achebe"> <spaitemprop="ame">ChiuaAchebe</spa> </a>(ISBN:<spaitemprop="isb">9780393932195</spa>) </spa> <imgitemprop="image"src="TFA_cover.jpg"></div> Wehopeyou'vebeeabletoattedourpastmeetigs<ul> <liitemprop="evet"itemscopeitemtype="https://schema.org/Evet"id="GBC_mtg_1"> … </li></ul> </mai>JSON-LD<scripttype="applicatio/ld+jso">{"@cotext":"https://schema.org","@type":"Orgaizatio","ame":"GeoBookClub","member":[{"@type":"Perso","@id":"ag","ame":"AliceNg"}],"evet":[{"@type":"Evet","@id":"GBC_mtg_2","about":{"@type":"Book","ame":"ThigsFallApart","isb":"9780393932195","author":{"@id":"https://ewp.org/Chiua_Achebe","@type":"Perso","ame":"ChiuaAchebe"},"image":{"@id":"TFA_cover.jpg"}}},{"@type":"Evet","@id":"GBC_mtg_1"}]}</script>
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