All links to Places (Search) API resources indicate the type of the resource being linked to with the type attribute. It is possible to filter links based on the type attribute.
A link can also point to an external resource type, in which case the type attribute is either a MIME media type or missing, but not a type URI, for example a via link object in an image or review object:
Note: In case a link object does not contain a type attribute, use the most universal http client available (usually a web browser) to open that link as it may connect to any kind of web resource.
Places (Search) API link objects follow the convention that when a link object is an attribute value, the attribute name signifies the relation type. For example, the via attribute on a review object signifies that the link is to the original document containing the review.