<bid>
xsd:decimal </bid>
[0..1]
'A price \"bid\" by a buyer for an asset, i.e. the price a buyer is willing to pay.'
<mid>
xsd:decimal </mid>
[0..1]
'A price midway between the bid and the ask price.'
<ask>
xsd:decimal </ask>
[0..1]
'A price \"asked\" by a seller for an asset, i.e. the price at which a seller is willing to sell.'