一个简单问题：SQL server xml xquery 语法

DECLARE @xmlvar xml
SET @xmlvar=’
<Motocross>
<Team Manufacturer=”Yamaha”>
<Rider>Tim Ferry</Rider>
<Rider>Chad Reed</Rider>
<Rider>David Vuillemin</Rider>
</Team>
<Team Manufacturer=”Honda”>
<Rider>Kevin Windham</Rider>
<Rider>Mike LaRacco</Rider>
<Rider>Jeremy McGrath</Rider>
</Team>
<Team Manufacturer=”Suzuki”>
<Rider>Ricky Carmichael</Rider>
<Rider>Broc Hepler</Rider>
</Team>
<Team Manufacturer=”Kawasaki”>
</Team>
</Motocross>’
--SELECT Motocross.Team.query(‘.’)
SELECT Motocross.Team.value(‘@Manufacturer’, ‘varchar (50)’) as Manufacturer
FROM @xmlvar.nodes(‘/Motocross/Team’) Motocross(Team)
WHERE Motocross.Team.exist(‘Rider’) = 1

上面的例子中这句：
FROM @xmlvar.nodes(‘/Motocross/Team’) Motocross(Team)
中 Motocross(Team)是什么意思？

没玩过XML, 是夫人的问题，大家帮忙看看？

谢谢