Private
| Description | A grouping element for content specific to the producing application. Its semantic significance is undefined and may be ignored by processors. |
|---|---|
| Namespace | 1.7 |
| Category | grouping |
Attributes
Specifies how the element is placed relative to surrounding content (e.g., block-level or inline flow).
Defines the direction of text flow (e.g., left-to-right, right-to-left, or vertical).
Sets the background color for the element’s content area.
Specifies the color of the border around the element.
Indicates the style of the border (e.g., solid, dashed, dotted).
Defines the thickness of the border line in user space units (such as points).
Determines the space between the element’s border (or boundary) and its inner content.
Applies the primary color (fill or stroke) for the text or graphic content.
Main indicator of type. This semantic association allows tools to present and support interaction with the object in a manner that is consistent with user expectations about other objects of that type.
Differences
Well tagged PDF:
The 'Private' element in Well-Tagged PDF is used for custom or proprietary content that does not conform to standard semantic elements. It allows for the inclusion of non-standard content.
Its use should be minimized and clearly documented. When employed, it must be encapsulated within the structure tree with explicit definitions to prevent interference with content extraction.
PDFUA:
In PDF/UA, 'Private' elements are discouraged because they can hinder accessibility. If used, they must be supplemented with standard tags or alternative descriptions.
Any private elements must include compensatory information to ensure that assistive technologies can interpret the content accurately.
Use cases
Tag Relationships
Permitted Parent Tags
Permitted Child Tags
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