Be able to validate XR 2.0 and 1.2

validator/src/main/resources/xslt/XR_12/XRechnung-CII-validation.xslt

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <xsl:stylesheet xmlns:svrl="http://purl.oclc.org/dsdl/svrl" xmlns:ccts="urn:un:unece:uncefact:documentation:standard:CoreComponentsTechnicalSpecification:2" xmlns:iso="http://purl.oclc.org/dsdl/schematron" xmlns:qdt="urn:un:unece:uncefact:data:standard:QualifiedDataType:100" xmlns:ram="urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100" xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100" xmlns:saxon="http://saxon.sf.net/" xmlns:schold="http://www.ascc.net/xml/schematron" xmlns:udt="urn:un:unece:uncefact:data:standard:UnqualifiedDataType:100" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
 <!--Implementers: please note that overriding process-prolog or process-root is 
     the preferred method for meta-stylesheets to use where possible. -->