Geo (microformat)

Geo is a microformat used for marking up WGS84 geographical coordinates (latitude;longitude) in (X)HTML.[1] Although termed a "draft" specification, this is a formality, and the format is stable and in widespread use;[2] not least as a sub-set of the published hCalendar[3] and hCard[4] microformat specifications, neither of which is still a draft.[3][4]

A Geo microformat, detected on the Wikipedia page for Great Barr, by Firefox's Operator extension. Users may add alternative mapping sources to those shown, which are included by default.

Use of Geo allows parsing tools (for example other websites, or Firefox's Operator extension) to extract the locations, and display them using some other website or mapping tool, or to load them into a GPS device, index or aggregate them, or convert them into an alternative format.

UsageEdit

The below describes the new version of the geo microformat, h-geo.

  • All properties are optional.[5]
  • The same number of decimal places should be used in each value, including trailing zeroes.[note 1]

The hGeo microformat is applied using three HTML classes. For example, the marked-up text:

<div>Belvide: 52.686; -2.193; 120</div>

becomes:

<div class="h-geo">Belvide: <span class="p-latitude">52.686</span>; <span class="p-longitude">-2.193</span>; <span class="p-altitude">120</span></div>

by adding the class-attribute values "h-geo", "p-latitude", "p-longitude", and "p-altitude".

This will display

Belvide: 52.686; -2.193; 120

and a geo microformat for that location, Belvide Reservoir, which will be detected, on this page, by microformat parsing tools.

Legacy GeoEdit

The legacy microformat uses the class-attribute values "geo", "latitude" and "longitude". There is no support for altitude. The legacy and modern attribute formats can coexist.

hCardEdit

Each Geo microformat may be wrapped in an hCard microformat, allowing for the inclusion of personal, organisational or venue names, postal addresses, telephone contacts, URLs, pictures, etc.

UsersEdit

Organisations and websites using Geo include:

Many[which?] of the organisations publishing hCard include a geo as part of that.

See alsoEdit

  • GeoSPARQL, Geographic Information System (GIS) data for the W3C Semantic Web using the Resource Description Framework (RDF) and SPARQL
  • Geo URI specified in RFC 5870
  • ISO 6709
  • ICBM address, an older geotagging format
  • Schema.org, web standard schema.org/geo.

NotesEdit

  1. ^ Must and should are used per the IETF document RFC 2119

ReferencesEdit

  1. ^ "Geo Spec". microformats community. Retrieved 17 August 2010.
  2. ^ "Extending HTML5 — Microformats". HTML5 Doctor. Retrieved 19 August 2010.
  3. ^ a b "hCalendar 1.0 Spec". Microformats community. Retrieved 17 August 2010.
  4. ^ a b "hCard 1.0 Spec". Microformats Community. Retrieved 17 August 2010.
  5. ^ "h-geo - Microformats Wiki". microformats.org.
  6. ^ "Microformats in Google Maps". Retrieved 30 April 2016.

External linksEdit