After [all that chatter](https://github.com/blue-button/bluebutton.js/pull/69#discussion_r6872349) about results vs. procedures this is how I'm proposing we make sure we're only dealing with the `<observation>` tags (i.e., actual results) instead of `<procedure>` tags (i.e., procedures) that can both appear within `<component>`s (i.e., results). Cf. https://github.com/blue-button/bluebutton.js/pull/69#discussion_r6871117 for more background on that.