DocumentID: ECMA-376/Part1/9.1.7
Title: ECMA-376, Part1: 9.1.7 Trash Items
Extracted-From: ECMA-376 Office Open XML File Formats, 1st Edition / December 2006
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9.1.7 Trash Items

Trash items represent parts that have been discarded or are no longer in use. Trash items shall not conform to OPC part naming guidelines as defined in Part 2 and shall not be associated with a content type. All trash items shall follow the naming scheme: [trash]/hhhh.dat where h represents a hexadecimal value.

[Example: A package has two parts that must be updated in-place but both parts have grown beyond their growth hints. The newer updated parts are added as new ZIP items while the original parts are renamed to:

[trash]/0000.dat
[trash]/0001.dat 

end example]