See our Breadcrumb doc for a full explanation of the Breadcrumb type, and how to encode Breadcrumbs data in RDFa or microdata. This page exists to contain a machine-readable microdata description of the Breadcrumb type itself (at the URI http://data-vocabulary.org/Breadcrumb).
An item with the item type http://data-vocabulary.org/Breadcrumb represents a Breadcrumb within a longer Breadcrumb trail. The following are the type's defined property names

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Property	Description
title	The title of a breadcrumb.
url	The URL of a breadcrumb.
child	The next breadcrumb in the hierarchy. The child must be another Breadcrumb item.