Performs a tests on the characteristics of a comment.
If the test is true, block content will be displayed
If the test fails, the block content will be ignored.
Attributes
is_ping
Tests whether comment is a trackback:
If the attribute value is 1, the test succeeds if the comment is a trackback
If the attribute value is 0, the test succeeds if the comment is not a trackback
better explain in which context this is useful
