breadcrumbs-formats
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This page is a collection of research regarding previous breadcrumbs formats towards the development of a breadcrumbs vocabulary and microformat per the process.
Bing breadcrumbs
Bing breadcrumbs format: http://onlinehelp.microsoft.com/en-us/bing/hh207240.aspx
add more formats
This strays more into sitemaps and topic description; related themes...
- Late-90s Mozilla/Netscape browser had built-in understanding of a sitemaps format expressed in RDF. Technical details are likely buried in Mozilla CVS [press releases still survive]. The vocabulary encoded a sitemap as a graph structure, using a 'child' property to represent hierarchy, as in other areas of Mozilla (e.g. [see Mozilla docs], [[1]]).
- Mozilla's RDF sitemaps were preceded by [Content Format] (MCF) sitemaps (Netscape took MCF from Apple ~1997). MCF sitemaps described a site hierarchy using a network of linked text files that summarised the site structure. MCF was an [[2]] of both RSS and RDF.
- ILRT / University of Bristol had a server-based implementation of the same format (now code-rotted), and experiments with alternatives that instead used more HTML concepts: see [draft spec]
- more recent work around RDF has focussed on describing hierarchies of topics using the [SKOS vocabulary]; this has gained significant traction in the library community, and many thesauri are now shared using SKOS. However it is not widely used to annotate in-page topic hierarchies. See [list of datasets using SKOS].
- Google Rich Snippets [a 'breadcrumbs' construct], as does its [successor]