[xsl] DOM node?

["james walker" <jameswalkerandy@xxxxxxxxxxx>]

When i created a select statement like this:

<xsl:apply-templates 
select="allrequirements/requirement[inscope/@key=('Multiuser' | 
'Application')]" />

and tried to perform a translation, i got an error saying "expression does 
not return a DOM node", so i tried:

<xsl:apply-templates 
select="allrequirements/requirement[inscope/@key=('Multiuser' | 
'Application')] | allrequirements/requirement[inscope/@key=('Application')]" 
/>

and itworked, what is a DOM node? and why did my code work? the only reason 
i tried it was because i have seen a for-each statement where many files are 
selected using the "|" operator.

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