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See:
Description
| Interface Summary | |
|---|---|
| CharacterSet | This interface defines properties of a character set, built in to the Saxon product. |
| Class Summary | |
|---|---|
| ASCIICharacterSet | This class defines properties of the US-ASCII character set |
| CharacterSetFactory | This class delivers a CharacterSet object for a given named encoding. |
| ISO88591CharacterSet | This class defines properties of the ISO-8859-1 character set |
| JavaCharacterSet | This class establishes properties of a character set that is known to the Java VM but not specifically known to Saxon. |
| UTF16CharacterSet | A class to hold some static constants and methods associated with processing UTF16 and surrogate pairs |
| UTF8CharacterSet | This class defines properties of the UTF-8 character set |
| XMLCharacterData | This module contains data regarding the classification of characters in XML 1.0 and XML 1.1, and a number of interrogative methods to support queries on this data. |
This package provides classes for handling different character sets, especially when serializing the output of a query or transformation.
Most of the classes in this package are implementations of the interface CharacterSet.
The sole
function of these classes is to determine whether a particular character is present in the
character set or not: if not, Saxon has to replace it with a character reference.
The actual translation of Unicode characters to characters in the selected encoding is left to the Java run-time library. (Note that different versions of Java support different sets of encodings, and there is no easy way to find out which encodings are supported in a given installation).
It is possible to configure Saxon to support additional character sets by writing an
implementation of the CharacterSet interface, and registering this class with the
Configuration using the call getCharaterSetFactory().setCharacterSetImplementation()
If an output encoding is requested that Saxon does not recognize, but which the Java
platform does recognize, then Saxon attempts to determine which characters the encoding
can represent, so that unsupported characters can be written as numeric character references.
Saxon wraps the Java CharSet object in a JavaCharacterSet object,
and tests whether a character is encodable by calling the Java interrogative
encoding.canEncode(), caching the result locally. Since this mechanism
appears to have become reliable in JDK 1.5, it is now used much more widely than before,
and most character sets are now supported in Saxon by relying on this mechanism.
Michael H. Kay
Saxonica Limited
9 June 2009
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