ISO IEC 19075-1:2021 pdf download – Information technology — Guidance for the use of database language SQL — Part 1: XQuery regular expressions. A first stop in answering this is to look at the definition of <XML query> in ISO/IEC 9075-14, which requires XML 1.0 as a basic level of support, and permits XML 1.1 support in the form of Feature X211, “XML 1.1 support”. So, character string can be normalized according to either XML 1.0 or XML 1.1 as an implementation-defined choice, or perhaps via a conformance feature. However, some of the line terminators, even in XML 1.0, are...