public Builder withProperty(String key, Object value) {
      properties.put(key, value);
      return this;
    }
Sets the given property of any Marshaller created by this factory.

<p>Example : <br>
<br>
<code>
   new JAXBContextFactory.Builder()
     .withProperty("com.sun.xml.internal.bind.xmlHeaders", "&lt;!DOCTYPE Example SYSTEM \&quot;example.dtd\&quot;&gt;")
     .build();
</code>
jaxb-jakarta/src/main/java/feign/jaxb/JAXBContextFactory.java