Historically, Digital Realty has been a "wholesale" data center operator with a real estate focus, while Equinix has more technology DNA, as well as $7.5 billion of capital invested thus far to build out its interconnection focused "Platform Equinix."
Refer to the input text as context and select the correct relationship between 'Equinix' and 'data center' from the available options.
Options: member of, employer, distributed by, product/material produced