Hi Arkadius, In BaseX, the serialization parameters were added to fn:serialize before the feature was added to the official spec, that’s why the implementation still differs a little. You’ll need to supply the CDATA section element names in a single string: let $map := map { "cdata-section-elements": "a xml c" } let $element := <xml>Hello</xml> return serialize($element,$map) If the element name has a namespace, the EQName notation will do the job: declare namespace prod = "http://datypic.com/prod"; let $map := map { "cdata-section-elements": "Q{http://datypic.com/prod}desc Q{http://datypic.com/prod}name" } let $element := <prod:name>Fleece Pullover</prod:name> return serialize($element,$map) We’ll align the behavior in a future version of BaseX. Hope this helps, Christian On Fri, Apr 3, 2020 at 6:51 PM Arkadiusz Bok <arkadiusz_bok@o2.pl> wrote:

Hi, I'm trying to run one of unchanged code example from book "XQuery: Search Across a Variety of XML Data 2nd Edition" from publisher O'Reilly Media.

(: XQuery by Priscilla Walmsley (c) 2016 Priscilla Walmsley:)

(:Example 13-4 Serialization parameters in a map :) xquery version "3.1"; declare namespace prod = "http://datypic.com/prod"; let $map := map { "method": "xml", "version": "1.0", "indent": true(), "cdata-section-elements": (xs:QName("prod:desc"),xs:QName("prod:name")), "use-character-maps": map { "«":"<%", "»":">%" } } let $element := <prod:name>Fleece Pullover</prod:name> return serialize($element,$map)

I'm using BaseX 9.3.2 to do this. But when I'm trying to run code, I get error:

Stopped at C:/Users/Arek/AppData/Local/Temp/example1304.xqy, 16/17: [SEPM0017] item() expected, xs:QName+ found: (Q{http://datypic.com/prod}desc, Q{http://datypic.com/prod}name).

When i remove 9 line with cdata-section-elements element, code runs. Whether is it problem with XQuery implementation or with code?