other variables are part of the built-in context. Let’s now examine the
structure of this built-in context, these implicit variables and how to use
them.</p>
<p>## Structure</p>
<p>As we’ve seen from the [example](#programming), a transaction context can
contain any number of user variables such as <cite>paperList</cite>.</p>
<p>The transaction context also contains two built-in elements that provide access
to a wide range of Fabric functionality ranging from the client application that
submitted the tr