188.8.131.52 Legacy Diagram Text Info part
An instance of this part type contains the text styling information for all legacy diagram text contained within the presentation.
A package shall contain at most one Legacy Diagram Text Info part, and that part shall be the target of an implicit relationship from the Presentation part ("[ISO/IEC-29500-1] §13.3.6").
The Legacy Diagram Text Info part is binary information that is defined in the PowerPoint 97-2003 Binary File Format (.ppt) Structure Specification (“[MS-PPT] Section 2.9.1; DocumentTextInfoContainer”).
A Legacy Diagram Text part shall be located within the package containing the source relationship (expressed syntactically, the TargetMode attribute of the Relationship element shall be Internal).
A Legacy Diagram Text part shall not have implicit or explicit relationships to any other part defined by Office Open XML File Formats [ISO/IEC-29500:2008].