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Pertinent Features of XFDL Structure
- Data Layer
 User input is stored in value option
User attachments stored in data items
- Presentation Layer
Presentation elements contain value option
Images stored in data items (base 64)
- Presentation Logic
Presentation elements contain
compute expression and 'current value'
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Digital signature on text copy of XFDL form =
Signature on data, presentation, and logic =
Transaction non-repudiation
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