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[xsl] Question on predicate patterns in XSLT 3.0

2016-09-03 06:21:52
from [Martin Honnen martin(_dot_)honnen(_at_)gmx(_dot_)de] [Permanent Link]
When trying to use predicate patterns in XSLT 3.0 (https://www.w3.org/TR/xslt-30/#doc-xslt30-patterns-Pattern30) I was kind of astonished that 

  .[predicate1][predicate2]

and

  .[predicate1 or predicate2]
are allowed while it is not allowed to form a union of two predicate patterns alike 

  .[predicate1] | .[predicate2]

Why is a union of predicate patterns not allowed?
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