DOM API is known for consuming big memories since all data in the XML document are loaded in XML content tree before parsing.
I found out there is a possibility that StAX API may consume as much as memory as DOM API.
The reason why I ask because in EPractice lab, a question "A company needs to process DOM documents received from its customers through an EJB 3 endpoint.
Which of the following APIs will a developer need to invoke to process these DOM documents"
The given answer is JAXP and StAX.
(I think DOM API in JAXP should be included in the choice as well.)