title: What XML schema dataType is space efficient for binary data?
body: <p>I'm creating an XML schema and need to include some fields of raw binary data.  What built-in datatype offers the most space efficient representation?  I see <code>base64Binary</code> and <code>hexBinary</code> as two possibilities but they both appear to be string representations of hexadecimal codes and thus not space efficient and also incur a time penalty to encode them. What built-in datatype would offer me the best space and time efficient representation of my binary data?</p>