Hello, Good news on my end. I was running the following 3 lines in the BaseX Editor: let $doc := 'd:\Temp\CDW\IFRS\InforSunSystems\id0001_TZ20180200_IFRS15_SunSystems_3TZ002.xml' let $stylesheet := 'd:\Temp\CDW\IFRS\InforSunSystems\IFRS15_SunSystemsOut.xslt' return xslt:transform($doc, $stylesheet) And getting the following error message: "" (Line 1): Content is not allowed in prolog. My XSLT stylesheet starts as follows: <?xml version="1.0"?> <xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="http://www.millicom.com" xmlns:functx="http://www.functx.com" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xsl:output method="text" encoding="UTF-8"/> <xsl:strip-space elements="*"/> Based on Martin's input, I changed the last line to: return xslt:transform-text($doc, $stylesheet) And everything is working. Thanks a lot! Regards, Yitzhak Khabinsky Technical Services Lead Millicom International Services LLC 396 Alhambra Circle, Suite 1100 Coral Gables, FL 33134 Skype4B: +1 (305) 445-4172 Tel: (954) 684-8673 yitzhak.khabinsky@millicom.com<mailto:.khabinsky@millicom.com> www.millicom.com<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.millicom.com%2F&data=02%7C01%7CMalcolm.Stewart%40microsoft.com%7C9338023699c2494d08be08d4ad12ce55%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636323743686702678&sdata=DxQ9dfL259rpdVZ9seOAcR6bvgxRobyIerOgvTgPc90%3D&reserved=0>