The unique ID attribute is similar to the text attribute;
the attribute values are edited and stored in the same way. The difference
between the unique ID and text attributes is that the values in a
unique ID attribute are unique: two elements in the same module cannot
have the same value for the attribute.
In the attribute editor:
- If Allow Editing is cleared, you cannot
edit the attribute value after the element is created.
- If Allow Empty Values is selected, any
number of elements can have an empty string as their attribute value.
- If Apply to Folders is selected, the unique
ID attribute is treated the same way for all elements in the module
(both folders and nodes). If this check box is cleared, the attribute
is treated as a normal text attribute for the folders: the attribute
values for folders have no restrictions.
You can reset the counter for unique ID using the option in the Modules view.