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Each of the ingest() and disseminate() methods that processes a package also takes an "options" parameter which is a {{ PackageParameters}} object. This object is a list of attribute-value pairs – an extension of the java.util.Properties list, which lets an attribute have multiple values so it can represent HTTP query arguments. The caller can use this flexible options list, along with some special knowledge of the packager, to fine-tune the request. For example a request for a METS DIP might use the options to list the types of descriptive metadata to be included, e.g. "dmd=MODS", "dmd=LOM". An option might also change the operation of the packager, e.g. telling a dissemination package to include all content by reference only instead of the contents of bitstreams, or to render just the metadata sections of the package manifest. Some standard option names and semantics ought to be developed, which apply to all package plugins.

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