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[xsl] Question on predicate patterns in XSLT 3.0

2016-09-03 06:21:52

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 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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