InvalidCharacterPosition (XmlDoc function)

Detect invalid characters (XmlDoc class)

InvalidCharacterPosition validates whether the characters in a string may be used as the value of an Element or Attribute node. The method checks the characters in its value argument and returns 0 if they are all valid; otherwise, it returns the position of the first invalid character.

Syntax

%position = %(XmlDoc):InvalidCharacterPosition( string, [AllowNull= boolean])

Syntax terms

%position	The numeric position of the first character that is not valid to be used as the value of an Element or Attribute node; otherwise, 0 if all characters are valid.
%(XmlDoc)	The class name in parentheses denotes a shared method. InvalidCharacterPosition can also be invoked via an XmlDoc object variable, which may be null.
string	The input string whose characters are to be validated. As of "Sirius Mods" Version 7.6, this may be a Unicode string or an EBCDIC string. Formerly, only EBCDIC was allowed.
AllowNull	This optional, but Name-Required, is a "Boolean Enumeration" which determines whether an input null character is considered invalid. The default value of AllowNull is False, which causes an input null character to be treated as invalid. If AllowNull is True, an input null is valid. AllowNull is available as of "Sirius Mods" Version 7.6.

Usage notes

• InvalidCharacterPosition returns zero if its argument string is:
  • Unicode, and all characters are legal in an XML document (the only illegal character is the null character, if AllowNull=False).
  • EBCDIC, and all characters are translatable to Unicode characters (and, if AllowNull=False, there are no null characters).

  Otherwise, it returns the character position of the first character that does not meet these criteria.

  Prior to "Sirius Mods" Version 7.6, the invalid characters of an Element or Attribute node were the EBCDIC "control characters."

• With the introduction of this method, the IsValidString function is deprecated.
• This method was actually introduced in "Janus Soap" Version 6.9, but its documentation first appeared in Version 7.0.

See also

XmlDoc class XmlNode class XmlNodelist class	List of XmlDoc methods List of XmlNode methods List of XmlNodelist methods List of XmlDoc API methods	XmlDoc methods syntax XmlNode methods syntax XmlNodelist methods syntax
Notation conventions for methods