videodata — Pointer to external video data
This element points to an external entity containing video data.
May be formatted inline or as a displayed block, depending on context. Rendering a video is usually accomplished by reserving a rectangular area on the display and “running” the video in that frame.
There are two ways to provide content for VideoData:
EntityRef or FileRef.  It is best to use only one of these
methods. However, if multiple sources are provided, 
EntityRef will be used in favor of 
FileRef.
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Enumerated values:  | |
|---|---|
| “center” | Centered horizontally  | 
| “char” | Aligned horizontally on the specified character  | 
| “justify” | Fully justified (left and right margins or edges)  | 
| “left” | Left aligned  | 
| “right” | Right aligned  | 
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Identifies the location of the data by external identifier (entity name)
Indentifies the location of the data by URI
Specifies the format of the data
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Enumerated values:  | |
|---|---|
| “0” | FIXME:  | 
| “1” | FIXME:  | 
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Enumerated values:  | |
|---|---|
| “bottom” | Aligned on the bottom of the region  | 
| “middle” | Centered vertically  | 
| “top” | Aligned on the top of the region  | 
FIXME: