[sc34wg3] Topic Equality test

[Patrick Durusau]

Greetings,

I was re-reading the TMDM and noticed that the topic item equality test 
in the TMDM says:

Equality rule: Two topic items are equal if they have:

- at least one equal string in their [subject identifiers] properties,

- at least one equal string in their [source locators] properties,

- at lease one equal string in their [subject locators] properties,

- an equal string in the [subject identifiers] property of the one topic 
item and the [source locators] property of the other, or

- the same information item in their [reified] property.

(Note, although not explicity stated, I am assuming "or" applies to all 
these equality conditions.)

Shouldn't the forth item, "an equal string in the [subject identifiers] 
property..." read:

"at least one equal string in the [subject identifiers] property..."

Reasoning that the test is:

topic one {{subject identifiers}{source locators}} intersection topic 
two {{subject identifiers}{source locators}} does not equal the empty set?

That is to say for merging purposes it really doesn't matter which test, 
1, 2, or 4 triggered the merge, it is enough that the merging was 
triggered?

Hope everyone is having a great day!

Patrick

-- 
Patrick Durusau
Patrick@Durusau.net
Chair, V1 - Text Processing: Office and Publishing Systems Interface
Co-Editor, ISO 13250, Topic Maps -- Reference Model
Member, Text Encoding Initiative Board of Directors, 2003-2005

Topic Maps: Human, not artificial, intelligence at work!