An immutable Open Packaging Convention compliant part name. [Docx4J comment: Note that in docx4J, part names should be resolved, before being set, so that they are absolute (ie start with '/'). In contrast, this class enforces the OPC specification, which says that a part name can't be absolute. For this reason, you'll see the leading '/' being added and removed in various places :( ]
@author Julien Chable
@version 0.1
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