Package com.sun.xml.dtdparser

Class XmlChars

java.lang.Object
com.sun.xml.dtdparser.XmlChars
public class XmlChars extends Object
Methods in this class are used to determine whether characters may appear in certain roles in XML documents. Such methods are used both to parse and to create such documents.
Version:
1.1, 00/08/05
Author:
David Brownell

  • Method Summary

    Modifier and Type
    Method
    Description
    static boolean
    isChar(int ucs4char)
    Returns true if the argument, a UCS-4 character code, is valid in XML documents.
    static boolean
    isLetter(char c)
    Returns true if the character is an XML "letter".
    static boolean
    isNameChar(char c)
    Returns true if the character is allowed to be a non-initial character in names according to the XML recommendation.
    static boolean
    isNCNameChar(char c)
    Returns true if the character is allowed to be a non-initial character in unscoped names according to the rules of the XML Namespaces proposed recommendation.
    static boolean
    isSpace(char c)
    Returns true if the character is allowed where XML supports whitespace characters, false otherwise.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • isChar

      public static boolean isChar(int ucs4char)
      Returns true if the argument, a UCS-4 character code, is valid in XML documents. Unicode characters fit into the low sixteen bits of a UCS-4 character, and pairs of Unicode surrogate characters can be combined to encode UCS-4 characters in documents containing only Unicode. (The char datatype in the Java Programming Language represents Unicode characters, including unpaired surrogates.)

      In XML, UCS-4 characters can also be encoded by the use of character references such as �, which happens to refer to a character that is disallowed in XML documents. UCS-4 characters allowed in XML documents can be expressed with one or two Unicode characters.

      Parameters:
      ucs4char - The 32-bit UCS-4 character being tested.
      Returns:
      true if the argument is valid in XML documents

    • isNameChar

      public static boolean isNameChar(char c)
      Returns true if the character is allowed to be a non-initial character in names according to the XML recommendation.
      Parameters:
      c - character to test
      Returns:
      true if the character is allowed to be a non-initial character
      See Also:

    • isNCNameChar

      public static boolean isNCNameChar(char c)
      Returns true if the character is allowed to be a non-initial character in unscoped names according to the rules of the XML Namespaces proposed recommendation. Except for precluding the colon (used to separate names from their scopes) these characters are just as allowed by the XML recommendation.
      Parameters:
      c - character to test
      Returns:
      true if the character is allowed to be a non-initial character
      See Also:

    • isSpace

      public static boolean isSpace(char c)
      Returns true if the character is allowed where XML supports whitespace characters, false otherwise.
      Parameters:
      c - character to test
      Returns:
      true if the character is allowed

    • isLetter

      public static boolean isLetter(char c)
      Returns true if the character is an XML "letter". XML Names must start with Letters or a few other characters, but other characters in names must only satisfy the isNameChar predicate.
      Parameters:
      c - character to test
      Returns:
      true if the character is an XML "letter"
      See Also: