Consider the following CJK unified ideograph characters5: U+6200 (戀), U+604B (恋), U+7231 (爱) and U+611B (愛).
The relevant subset of the label generation rules for Chinese coming from the generation panel (und-hani-TBD-root) might be represented this way:
|
Code point
|
Allocatable variant
|
Blocked variant
|
Tag
|
|
恋
U+604B
|
戀
U+6200
|
-
|
und-hani-TBD-root
|
|
戀
U+6200
|
恋
U+604B
|
-
|
und-hani-TBD-root
|
|
愛
U+611B
|
爱 U+7231
|
-
|
und-hani-TBD-root
|
|
爱 U+7231
|
愛
U+611B
|
-
|
und-hani-TBD-root
|
The generation panel for
Japanese (und-jpan-TBD-root) might come up with a different set of rules:
|
Code point
|
Allocatable variant
|
Blocked variant
|
Tag
|
|
恋
U+604B
|
-
|
戀
U+6200
|
und-jpan-TBD-root
|
|
戀
U+6200
|
-
|
恋
U+604B
|
und-jpan-TBD-root
|
|
愛
U+611B
|
- |
-
|
und-jpan-TBD-root
|
Now, remember that the
integration panel is required to integrate the proposals into a single set of
label generation rules, and that it is allowed to add blocking rules to any
tagged repertoire in order to achieve this goal6. In this example, one additional blocking rule is needed and the
unified rules for these code points will be as follows
|
Code point
|
Allocatable variant
|
Blocked variant
|
Tag
|
|
恋
U+604B
|
戀
U+6200
|
-
|
und-hani-TBD-root
|
|
恋
U+604B
|
-
|
戀
U+6200
|
und-jpan-TBD-root
|
|
戀
U+6200
|
恋
U+604B
|
-
|
und-hani-TBD-root
|
|
戀
U+6200
|
-
|
恋
U+604B
|
und-jpan-TBD-root
|
|
愛
U+611B
|
爱 U+7231
|
-
|
und-hani-TBD-root
|
|
愛
U+611B
|
- |
爱 U+7231
|
und-jpan-TBD-root
|
|
爱 U+7231
|
愛
U+611B
|
-
|
und-hani-TBD-root
|
As a consequence of these
rules, a root label that used the code point U+604B would block a label with
U+6200 in the same position when applied for using the und-jpan-TBD-root tag,
but it would produce an allocatable label were it applied for under the
und-hani-TBD-root tag.
Applying for U+611B using the
und-jpan-TBD-root blocks the use of U+7231 in the same location in any label, no
matter which tag it is applied under. This is so, even though U+7231 is not a
character in Japanese at all. and does not appear in the tagged repertoire
und-jpan-TBD-root. Because it is not part of that repertoire, it cannot be used
in any label applied for with the und-jpan-TBD-root
tag.