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2. PDF/A - Wikipedia

   en.wikipedia.org/wiki/PDF/A

   PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...

3. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   The Preview application can display PDF files, as can version 2.0 and later of the Safari web browser. System-level support for PDF allows macOS applications to create PDF documents automatically, provided they support the OS-standard printing architecture. The files are then exported in PDF 1.3 format according to the file header.

4. Help:External link icons - Wikipedia

   en.wikipedia.org/wiki/Help:External_link_icons

   To get this link, go to the file page and click on the image to open it without the file description, then copy the URL. To remove a default icon, simply add the CSS with no URL. For example, to remove the padlock icon when viewing secure links: #

5. Charset detection - Wikipedia

   en.wikipedia.org/wiki/Charset_detection

   Due to the unreliability of heuristic detection, it is better to properly label datasets with the correct encoding. See Character encodings in HTML#Specifying the document's character encoding. Even though UTF-8 and UTF-16 are easy to detect, some systems require UTF encodings to explicitly label the document with a prefixed byte order mark (BOM).

6. Round-trip format conversion - Wikipedia

   en.wikipedia.org/wiki/Round-trip_format_conversion

   The XML document should contain identical information to the legacy format. An important condition is that the roundtrip (legacy → XML → legacy') should result in effectively identical documents. Because some document structures allow some flexibility in content order, whitespace, case-sensitivity, etc. it is useful to have a means of ...

7. UTF-8 - Wikipedia

   en.wikipedia.org/wiki/UTF-8

   It was designed for backward compatibility with ASCII: the first 128 characters of Unicode, which correspond one-to-one with ASCII, are encoded using a single byte with the same binary value as ASCII, so that a UTF-8-encoded file using only those characters is identical to an ASCII file.