The package’s relationships lead to the property parts, in docProps/. They
are the same as in other Office Open XML files.
Core properties
docProps/core.xml, reached through a
core-properties relationship: dc:title,
dc:subject, dc:creator, cp:keywords,
dc:description, cp:lastModifiedBy, cp:revision,
dcterms:created, dcterms:modified and
cp:category.
Application properties
docProps/app.xml, reached through an extended-properties
relationship. Fields that matter for a presentation include
Application, AppVersion, Company,
Template, TotalTime (in minutes), Words,
PresentationFormat, Slides, Notes and
HiddenSlides. These counts are written by the application and can be
out of date.
Custom properties
docProps/custom.xml holds any further named values a user or program has set.