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Breadcrumbs can contain a number of different properties which you can label using Microdata, RDFa markup, or JSON-LD. Google Breadcrumbs Structured Data Documentation Updated [developers.google.com]
Google has updated its data on breadcrumb trails, and how it indicates the page's position in the site's hierarchy.
but my own breadcrumbs - which don't use any special markup - are now shown in Google SERPs, so it obviously works.