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Devanagari is a Unicode block containing characters for writing languages such as Hindi, Marathi, Bodo, Maithili, Sindhi, Nepali, and Sanskrit, among others.In its original incarnation, the code points U+0900..U+0954 were a direct copy of the characters A0-F4 from the 1988 ISCII standard.
In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). The format is the same as for any entity reference: &name;
The Unicode equivalent is U+200D ZERO WIDTH JOINER . However, as noted below, the ISCII halant character can be doubled or combined with the ISCII nukta to achieve effects created by ZWNJ or ZWJ in Unicode. For this reason, Apple maps the ISCII INV character to the Unicode left-to-right mark, so as to guarantee round-tripping. [1]
Pc: Punctuation, connector: Graphic: Character 10: Includes spacing underscore characters such as "_", and other spacing tie characters. Unlike other punctuation characters, these may be classified as "word" characters by regular expression libraries. [f] Pd: Punctuation, dash: Graphic: Character 27: Includes several hyphen characters Ps ...
Unicode's encoding models for Devanagari, Tamil, Kannada, Sinhala and emoji require use of the invisible zero-width joiner and zero-width non-joiner characters. The existing Unicode character model for Tamil is, like most of Indic Unicode, [b] an abugida-based model derived from ISCII. It been criticized for several reasons. [1]
A Unicode character is assigned a unique Name (na). [1] The name is composed of uppercase letters A–Z, digits 0–9, hyphen-minus and space.Some sequences are excluded: names beginning with a space or hyphen, names ending with a space or hyphen, repeated spaces or hyphens, and space after hyphen are not allowed.
The Universal Coded Character Set (UCS, Unicode) is a standard set of characters defined by the international standard ISO/IEC 10646, Information technology — Universal Coded Character Set (UCS) (plus amendments to that standard), which is the basis of many character encodings, improving as characters from previously unrepresented writing systems are added.
Unicode was designed to provide code-point-by-code-point round-trip format conversion to and from any preexisting character encodings, so that text files in older character sets can be converted to Unicode and then back and get back the same file, without employing context-dependent interpretation.