Customization files containing binding declarations are passed to the JAXB Binding compiler, xjc, using the following syntax:
xjc -b file schema
where file is the name of binding customization file, and schema is the name of the schema or schemas you want to pass to the binding compiler.
You can have a single binding file that contains customizations for multiple schemas, or you can break the customizations into multiple bindings files; for example:
xjc schema1.xsd schema2.xsd schema3.xsd -b bindings123.xjb xjc schema1.xsd schema2.xsd schema3.xsd -b bindings1.xjb -b bindings2.xjb -b bindings3.xjb
Note that the ordering of schema files and binding files on the command line does not matter, although each binding customization file must be preceded by its own -b switch on the command line.
For more information about xjc compiler options in general, see JAXB Compiler Options.