PDF/A is suggested as a preferred format for page-oriented textual (or primarily textual) documents when layout and visual characteristics are more significant than logical structure. Note that, for PDFs based on page images digitized by scanning, the source images are considered the master format if available and PDFs created from those images may be optimized for access convenience.
D-Lib Magazine is a solely electronic publication with a primary focus on digital library research and development, including but not limited to new technologies, applications, and contextual social and economic issues