ogc-schemas | XML - Java and XML - JS for OGC XSDs

I'm using the OGC schemas from https://github.com/highsource/ogc-schemas.

I'm looking at the unmarshalled object structure from deserializing XML to the JaxB object.

I'm trying to construct a custom object to serialize to XML using JaxB.

The filter schema is seen http://schemas.opengis.net/filter/2.0/filter.xsd

I'm unmarshalling the object like so:

JAXBElement filter = (JAXBElement) unmarshal.unmarshal(new File("Filter01.xml"));

Now, I'm looking at the internal objects and see that I have different filter types. I want to create a filter type that is a binarylogicaloperator and initialize it with the proper data. The initialization part of this is what is confusing to me.

IE:

BinaryLogicOpType blop = new BinaryLogicOpType();