https://github.com/FasterXML/jackson-dataformat-xml: Data format extension for Jackson (http://jackson.codehaus.org) to offer alternative support for serializing POJOs as XML and deserializing XML as pojos. Support implemented on top of Stax API (javax.xml.stream), by implementing core Jackson Streaming API types like JsonGenerator, JsonParser and JsonFactory. Some data-binding types overridden as well (ObjectMapper sub-classed as XmlMapper). (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
package com.fasterxml.jackson.dataformat.xml.util;

import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.dataformat.xml.XmlAnnotationIntrospector;
import com.fasterxml.jackson.module.jaxb.JaxbAnnotationIntrospector;

public class AnnotationUtil
{
    public static String findNamespaceAnnotation(AnnotationIntrospector ai,
            AnnotatedMember prop)
    {
        for (AnnotationIntrospector intr : ai.allIntrospectors()) {
            if (intr instanceof XmlAnnotationIntrospector) {
                String ns = ((XmlAnnotationIntrospector) intr).findNamespace(prop);
                if (ns != null) {
                    return ns;
                }
            } else  if (intr instanceof JaxbAnnotationIntrospector) {
                String ns = ((JaxbAnnotationIntrospector) intr).findNamespace(prop);
                if (ns != null) {
                    return ns;
                }
            }
        }
        return null;
    }

    public static Boolean findIsAttributeAnnotation(AnnotationIntrospector ai,
            AnnotatedMember prop)
    {
        for (AnnotationIntrospector intr : ai.allIntrospectors()) {
            if (intr instanceof XmlAnnotationIntrospector) {
                Boolean b = ((XmlAnnotationIntrospector) intr).isOutputAsAttribute(prop);
                if (b != null) {
                    return b;
                }
            } else  if (intr instanceof JaxbAnnotationIntrospector) {
                Boolean b = ((JaxbAnnotationIntrospector) intr).isOutputAsAttribute(prop);
                if (b != null) {
                    return b;
                }
           }
        }
        return null;
    }

    public static Boolean findIsTextAnnotation(AnnotationIntrospector ai,
            AnnotatedMember prop)
    {
        for (AnnotationIntrospector intr : ai.allIntrospectors()) {
            if (intr instanceof XmlAnnotationIntrospector) {
                Boolean b = ((XmlAnnotationIntrospector) intr).isOutputAsText(prop);
                if (b != null) {
                    return b;
                }
            } else  if (intr instanceof JaxbAnnotationIntrospector) {
                Boolean b = ((JaxbAnnotationIntrospector) intr).isOutputAsText(prop);
                if (b != null) {
                    return b;
                }
            }
        }
        return null;
    }

    public static Boolean findIsCDataAnnotation(AnnotationIntrospector ai,
                                               AnnotatedMember prop)
    {
        for (AnnotationIntrospector intr : ai.allIntrospectors()) {
            if (intr instanceof XmlAnnotationIntrospector) {
                Boolean b = ((XmlAnnotationIntrospector) intr).isOutputAsCData(prop);
                if (b != null) {
                    return b;
                }
            }
        }
        return null;
    }
}