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Geo (microformat)

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Geo (microformat)

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

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]

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.

Usage

  • If latitude is present, so must be longitude, and vice versa.
  • The same number of decimal places should be used in each value, including trailing zeroes.[note 1]

There are two ways to convert ordinary (X)HTML into a geo microformat:

Three classes

Adding three classes. For example the marked-up text:

Belvide: 52.686; -2.193

becomes:

Belvide: 52.686; -2.193

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

This will display

Belvide: 52.686; -2.193

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

One class

In some cases, a shorthand version may be used, with just the outer class. Latitude must be first:

Belvide Reservoir is at 52.686; -2.193.

becomes:

Belvide Reservoir is at 52.686; -2.193.

Note that the separator must be a semi-colon (;). If the display of some other separator is desired, then the abbr element can be used, with the value to be interpreted placed in its title attribute:

Belvide Reservoir is at 52.686, -2.193.

This can also be used to display the location using some other schema:

Belvide Reservoir is at Grid reference SJ870099.

However, it is considered bad practice to use abbr to hide the location completely:

Belvide Reservoir is nice to visit.

Accessibility concerns

Concerns have been expressed [5] that the use of the abbr element (using the so-called abbr-design-pattern) in the above manner causes accessibility problems, not least for users of screen readers and aural browsers. Work is underway to find an alternative method of presenting coordinates.

hCard

Each Geo microformat may be wrapped in an URLs, pictures, etc.

Extensions

There are three active proposals, none mutually-exclusive, to extend the geo microformat:

  • geo-extension - for representing coordinates on other planets, moons etc., and with non-WGS84 schema
  • geo-elevation - for representing altitude
  • geo-waypoint - for representing routes and boundaries, using waypoints

Users

Organisations and websites using Geo include:

Many of the organisations publishing hCard include a geo as part of that.

See also

Notes

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

References

  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. ^ Web Standards Project, hAccessibility: Abbreviations in Microformats
  6. ^ "Microformats in Google Maps". Retrieved 25 August 2010. 

External links

  • Geo spec with notes and examples
  • Geo cheat-sheet a quick reference
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