1328 Limitation on the size of data type templates identifiers
Created: 12 Nov 2014
Status: In Force (green)
Part: Part 6 (2009-12; Edition 2)
Clause: 9.5.2, 9.5.3, 9.5.6
Category: Issue may impact interoperability of implementations of Edition 2
All data type template elements (LNodeType, DOType, DAType, EnumType) have an identifier (attribute "id"), which is defined to be a non-empty string (xs:normalizedString).
There is no upper limit on the size of this identifier (xs:normalizedString has no upper-limit).
There should be an upper-limit to guarantee proper and (more) efficient (memory-wise) implementation in tools and IEDs.
I propose to limit the identifier of a DTT to max 255 characters (as there are already quite long identifiers out there).
Concrete implementation: modify "tIDNaming" by adding the facet maxLength="255" to the attribute "id".
||17 Apr 15
||In Force (green)
Accepted to limit the length of all identifiers to 255 characters, if no tighter limits exist already. Further, the syntax shall comply to 'xs:token', i.e. no space, tab and similar characters are allowed.
||02 Apr 15
I think Camille's proposition to use xs:token instead of xs:normalizedString is a good one (the difference is that for a token the leading and trailing spaces are removed, duplicate spaces are replaced by one space).
I do no see any compatibility issues on this change.
|26 Mar 15
This TISSUE is important, but we may go further in the restrictions for the ID. There're some cases which seems not "usefull" for an ID, like " " (a sequence of space characters) which is valid regarding schema but not really useable for an ID.
One solution could be to use a token instead of normalized string.
It could be the good moment to push this change as this tissue already add a new restriction, so with potential backward compatibility issues.
|10 Dec 14
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