Is this a legal xquery with full text search?

("abc", "def", "ghi") ftcontains "abc"

Note that for function fts:FTContainsExpr(),
 the  $searchContext is a sequence of atomic values, not a sequence of
nodes. If $ignoreNodes is not empty, then the 'is' operation in fts:reconstruct()
should raise errors for atomic values because it is illegal to do 'is' xquery
operation on  atomic values.  
However, if $ignoreNodes is empty, then I think it is OK to do search on atomic
values even though the 4.1 Tokenization process stated that 'the process of converting the string value of a node to a sequence of token occurrences'
only cover the node case, not atomic value case.