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XPath +/- etc not first class functions

From
Ihe Onwuka <>
To
"" <>
Date
2017-08-28T06:00:01Z
ID
<CALfs7+w1QKq9p4KCXuZOUq1bHtP_H2v+=14Wf=>
Thread
XPath +/- etc not first class functions
The examples at 

https://www.w3.org/TR/xpath-functions-31/#func-fold-left

would seem to suggest that primitives such as + and - cannot be passed as values. 

Correct?
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