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While regular characters make up the English and European alphabets and the corresponding basic set of figures and symbols, there are many other special characters that belong to various other language representations, such as Arabic, Indian, Japanese, Chinese, or Korean. Oxygen XML Author provides support for special characters in various ways:

Opening and Saving Documents
The Unicode standard provides support for all the character symbols in all known languages andOxygen XML Author provides support for all Unicode characters. There are various encoding options and features to help determine how to handle documents with unsupported characters.
Fonts
Oxygen XML Author provides the ability to choose the fonts to be used in the various editing modes. In some cases, changing the font may be a solution when special characters are not rendered as expected.
For special characters that are not included in any of the default fonts, Oxygen XML Author tries to find that symbol in a fallback font. For the Author editing mode, you can specify a set of fallback fonts in the font-family CSS property (in the particular CSS file used for rendering your documents). For more information, see the Customizing Author Mode Through CSS section.
Tip: For documents written in languages that use special characters (such as Japanese or Chinese), change the font to one that supports the specific characters (a Unicode font). For the Windows platform, Arial Unicode MS or MS Gothic is recommended. To change the font in Oxygen XML Author, open the Preferences dialog box (Options > Preferences), go to Appearance > Fonts. You can select a font for each editing mode in this preferences page.
Navigation and Layout
Oxygen XML Author supports bidirectional text, such as Arabic, Hebrew, and certain Asian languages, or other special characters that are combined into a single glyph. In Text mode, you can enable or disable the support for special characters. See Special Character Support in Text Mode for details about which option to choose.
Editing
Oxygen XML Author includes a contextual menu action that converts a sequence of hexadecimal characters to the corresponding Unicode character.

If you do not have a special way of inserting special characters using your keyboard, you can insert special characters using the Character Map feature.