The property map may contain pre-defined implementation specific and default properties. Users are encouraged to read the information and fully understand the implications, before modifying pre-existing properties.
Implementation specific properties are prefixed with a package name associated with the implementor, beginning with com. or a similar prefix. All property names beginning with pack. and unpack. are reserved for use by this API.
Unknown properties may be ignored or rejected with an unspecified error, and invalid entries may cause an unspecified error to be thrown.
The returned map implements all optional {@link SortedMap} operations @return A sorted association of property key strings to property values.
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