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Did not expect element there

An element the RelaxNG pattern does not allow at this point.

The message, as the validator reports it
Did not expect element extra there

Why it happens

  • An element that is not in the schema, or is in a different namespace.
  • Elements out of order: in a RelaxNG group (the default) the order matters; only interleave lets them come in any order.

How to fix it

Remove the element, move it to where the schema allows it, or put it in the namespace the schema uses.

Example

Validated against book.rng, below.

Reports the error
<book isbn="1">
  <title>T</title>
  <year>2020</year>
  <extra/>
</book>
Fixed
<book isbn="1">
  <title>T</title>
  <year>2020</year>
</book>
book.rng 
<element name="book" xmlns="http://relaxng.org/ns/structure/1.0"
         datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <attribute name="isbn"><data type="string"/></attribute>
  <element name="title"><text/></element>
  <element name="year"><data type="gYear"/></element>
</element>