I think that a factor contributing to typos in ebooks is that ebooks are still relatively new and the publishing industry is adapting to the change. I think that as the industry adapts to the change errors in ebooks will become less common.
One way errors could be reduced is to maintain a book's electronic source text in a form that can be easily formatted for many uses. It could be something like a plain text file with plain text markup to indicate intended formatting (such as [Bold text starts here]). The markup could be similar to HTML, but intended to be read by a human, rather than interpreted by a computer. A human takes the source text file and formats it in accordance with the instructions for a specific ebook format.
I think that ebooks are in the same statues as CDs and digital audio recording were in the early days. Due to the differences between analog and digital recording, it took the recording industry time to adjust to the change and I think that it will be the same with ebooks.
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