exi header document

Hello,

Just wondering if anyone could break this message down, I've encoded the
options document below with EXIficient, but I missing something fundamental
regarding strict schema informed encodings.

<header xmlns="http://www.w3.org/2009/exi">
<strict/>
</header>

This results in the following bytes (minus the cookie):

a0 48

a0 = 10 | 1 | 0 0000 // distinguished bits, options present, version

48 = ? //

Best,
Mark