Class: XML_Query2XML_ISO9075Mapper

[line 65]
Maps SQL identifiers to XML names according to Final Committee Draft for ISO/IEC 9075-14:2005, section "9.1 Mapping SQL <identifier>s to XML Names".

ISO/IEC 9075-14:2005 is available online at http://www.sqlx.org/SQL-XML-documents/5FCD-14-XML-2004-07.pdf

A lot of characters are legal in SQL identifiers but cannot be used within XML names. To begin with, SQL identifiers can contain any Unicode character while XML names are limited to a certain set of characters. E.g the SQL identifier "<21yrs in age" obviously is not a valid XML name. '#', '{', and '}' are also not allowed. Fully escaped SQL identifiers also must not contain a column (':') or start with "xml" (in any case combination). Illegal characters are mapped to a string of the form _xUUUU_ where UUUU is the Unicode value of the character.

The following is a table of example mappings:

 +----------------+------------------------+------------------------------------+
 | SQL-Identifier | Fully escaped XML name | Comment                            |
 +----------------+------------------------+------------------------------------+
 | dept:id        | dept_x003A_id          | ":" is illegal                     |
 | xml_name       | _x0078_ml_name         | must not start with [Xx][Mm][Ll]   |
 | XML_name       | _x0058_ML_name         | must not start with [Xx][Mm][Ll]   |
 | hire date      | hire_x0020_date        | space is illegal too               |
 | Works@home     | Works_x0040_home       | "@" is illegal                     |
 | file_xls       | file_x005F_xls         | "_" gets mapped if followed by "x" |
 | FIRST_NAME     | FIRST_NAME             | no problem here                    |
 +----------------+------------------------+------------------------------------+

map   [line 77]

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