How to get tag parameter value with XQuery

For example i have this xml. I need to get value of parameter val of tag foo with id="two"

<top>
    <sub id="one">
        <foo id开发者_开发百科="two" val="bar" />
        sometext
    </sub>
</top>

Whis this query (using Qt QXmlQuery):

doc('test.xml')/top/sub[@id='one']/foo[@id='two']/<p>{@val}</p>

I receive <p val="bar"/>, but I need only text "bar" without any tags. I tried to remove <p> and </p> and receive syntax error, unexpected {

How can i get parameter value without any tags?

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If you try to serialize just an attribute you will get an error. You may be better off just retrieving the value of the attribute:

doc('test.xml')/top/sub[@id='one']/foo[@id='two']/@val/data(.)

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Sorry a bit late in the day... try

data(doc('/db/test/test.xml')/top/sub[@id='one']/foo[@id='two']/@val)

which returns just the text value of the attribute

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doc('test.xml')/top/sub[@id='one']/foo[@id='two']/@val