AI-generated Key Takeaways
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          PlaceholderType defines various types of placeholders, many corresponding to ECMA-376 standard placeholder IDs. 
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          You can access a specific placeholder type by calling its parent class, name, and property, such as SlidesApp.PlaceholderType.BODY.
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          The different placeholder types include body text, charts, pictures, titles, and many others. 
The placeholder types. Many of these placeholder types correspond to placeholder IDs from the ECMA-376 standard. More information on those shapes can be found in the description of the "ST_PlaceholderType" type in section 19.7.10 of "Office Open XML File Formats - Fundamentals and Markup Language Reference", part 1 of ECMA-376 5th edition.
To call an enum, you call its parent class, name, and property. For example, 
SlidesApp.PlaceholderType.BODY.
Properties
| Property | Type | Description | 
|---|---|---|
| UNSUPPORTED | Enum | A placeholder type that is not supported. | 
| NONE | Enum | Not a Placeholder. | 
| BODY | Enum | Body text. | 
| CHART | Enum | Chart or graph. | 
| CLIP_ART | Enum | Clip art image. | 
| CENTERED_TITLE | Enum | Title centered. | 
| DIAGRAM | Enum | Diagram. | 
| DATE_AND_TIME | Enum | Date and time. | 
| FOOTER | Enum | Footer text. | 
| HEADER | Enum | Header text. | 
| MEDIA | Enum | Multimedia. | 
| OBJECT | Enum | Any content type. | 
| PICTURE | Enum | Picture. | 
| SLIDE_NUMBER | Enum | Number of a slide. | 
| SUBTITLE | Enum | Subtitle. | 
| TABLE | Enum | Table. | 
| TITLE | Enum | Slide title. | 
| SLIDE_IMAGE | Enum | Slide image. |