As stated in the title I want to ignore casing of element names in a document.
static class XY433 { @XmlAttribute(name = \"C200\") String c200; @
I am using moxy 2.7.1 version and it is working fine with UnmarshallerProperty as below.
unmarshaller.setProperty(UnmarshallerProperties.UNMARSHALLING_CASE_INSENSITIVE, true);
eclipselink documentation