d-ellipsis> Key Concepts </span> </a> </li> <li class=md-nav__item> <a href=../terminology/ class=md-nav__link> <span class=md-ellipsis> Terminology </span> </a> </li> <li class=md-nav__item> <a href=../architecture/ class=md-nav__link> <span class=md-ellipsis> Architecture </span> </a> </li> <li class=md-nav__item> <a href=../core-components/ class=md-nav__link> <span class=md-ellipsis> Core Components </span> </a> </li> <li class=md-nav__item> <a href=../api-guidelines/ class=md-nav__link> <span class=md-