A parts list whose first column is a picture rather than a word. Each picture is marked as one and carries the words a reader hears in its place, so nothing in the list is lost on somebody who cannot see it. Validates as PDF/A-3a and PDF/UA-1.
A picture says nothing to software reading a document aloud, so a tagged file has to speak in its place. This parts list has a picture where its first column would hold a word, and each picture carries the sentence a reader hears instead.
The plan is not built by hand: the table hands back the part describing itself, pictures and all, from the same counter the page numbers its marks from. Where the tagged prose example shows headings and paragraphs, this shows the one thing prose cannot — a picture inside a cell that a reader has to be told about.
The same document is written twice, once in each language. Both files are shown in full, with the code coloured on the server, and can be copied in one click.
The same document is written in each of these languages. Open the one you want to look at.
| Before | 169,424 bytes |
|---|---|
| Now | 98,908 bytes |
| Saved | 41.6 % |
Not one mark on the page changed. See every document measured.
Three rules — centimetres, inches and points — on a page that states it must print at exactly the size it was drawn, and that the reader is to offer nothing else. That second request only exists from PDF 2.0 on, so the file declares 2.0 rather than changing version without you knowing.
Two sittings bound into one file. Each page carries a record of its own — what it is, whose hand wrote it, when — the photograph on the second page carries one too, and each transcription is tied to the page it transcribes rather than to the file at large. Tying an attached file to anything but the whole document only exists from PDF 2.0 on, so the file declares 2.0.
A records office's reference, the department it came from, the date until which the document must be kept and its classification, in a PDF/A-3 file. No standard knows what a retention date is, so each field arrives with a description of itself — its type, who it is written for, what it means — which is what makes a checker accept information you invented. The page prints the same list, so what a person reads and what a machine reads cannot drift apart.
A document that says what each run of ink stands for, and which runs are only trimmings. Its text and its table describe themselves, a paragraph and a cell at a time. Validates as PDF/A-3a and PDF/UA-1.
An electronic invoice: a PDF/A-3 file carrying its own XML.
Links and marks hung on text the engine has already placed: a band behind a line, an underline, a boxed cell — every rectangle taken from what the layout and the table report afterwards, none of it measured by hand.