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IDProjectCategoryView StatusDate SubmittedLast Update
000299810000-003: Address SpaceSpecpublic2015-03-17 17:262015-06-09 18:49
ReporterNathan PocockAssigned ToWolfgang Mahnke  
PrioritynormalSeverityminorReproducibilityhave not tried
Status closedResolutionfixed 
Target Version1.03Fixed in Version1.03 
Summary0002998: 8.33 Structure: inheritence rules inconsistent?
Description

Section 8.33 says "This abstract DataType is the base DataType for all Structured DataTypes like Argument defined in 8.6. All DataTypes inheriting from this DataType have a special handling for the encoding as defined in Part 6. All Structured DataTypes shall inherit from this DataType if they are not defined as primitives in this standard (like NodeId defined in 8.2, a NodeId is structured but treated in a special way as defined in Part 6)."

However, the reality is a little different. It seems that in some cases structures can derive from structures, such as AnonymousIdentityToken, UserNameIdentityToken, and X509IdentityToken; all three derive from UserIdentityToken (which derives from Structure).

The CMPWG has a test-case based on the spec that says all structures derive from "Structure", but during CTT development this inconsistency was found. An ongoing discussion within the CMPWG reveals that there are several interpretations of the spec as it currently stands.

Can structures inherit from other structures?
Can namespaceIndex=0 types inherit from structures only?

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Matthias Damm

2015-03-26 14:51

developer   ~0005986

Nothings says that structure data types must be derived from Structure directly.

We have a type hierarchy or structure types already in OPC UA specifications. In some companion specifications we have even a structure type hierarchy several levels deep.

Jim Luth

2015-05-05 15:36

administrator   ~0006043

Clarify that "inherit" in this case is directly or indirectly.

Wolfgang Mahnke

2015-06-01 10:32

developer   ~0006102

The spec already clearly state the rules.

Not in the place you have looked, but in 5.8.2
"Structured DataTypes are DataTypes that represent structured data and are not defined as Built-in DataTypes. Structured DataTypes inherit directly or indirectly from the DataType Structure defined in 8.33."

Please be aware that we do not repeat all information in various places since this would become a maintenance nightmare.

Wolfgang Mahnke

2015-06-09 16:38

developer   ~0006117

discussed in phone call to remove sentence.

Wolfgang Mahnke

2015-06-09 16:40

developer   ~0006118

removed the sentence at all, already discussed in phone call 2015-06-09

Jim Luth

2015-06-09 18:49

administrator   ~0006121

Agreed to changes in telecon.

Issue History

Date Modified Username Field Change
2015-03-17 17:26 Nathan Pocock New Issue
2015-03-26 14:51 Matthias Damm Note Added: 0005986
2015-05-05 15:36 Jim Luth Note Added: 0006043
2015-05-05 15:36 Jim Luth Target Version => 1.03
2015-05-05 15:36 Jim Luth Assigned To => Wolfgang Mahnke
2015-05-05 15:36 Jim Luth Status new => assigned
2015-06-01 10:32 Wolfgang Mahnke Note Added: 0006102
2015-06-01 10:32 Wolfgang Mahnke Status assigned => resolved
2015-06-01 10:32 Wolfgang Mahnke Resolution open => won't fix
2015-06-09 16:38 Wolfgang Mahnke Note Added: 0006117
2015-06-09 16:38 Wolfgang Mahnke Status resolved => feedback
2015-06-09 16:38 Wolfgang Mahnke Resolution won't fix => reopened
2015-06-09 16:40 Wolfgang Mahnke Note Added: 0006118
2015-06-09 16:40 Wolfgang Mahnke Status feedback => resolved
2015-06-09 16:40 Wolfgang Mahnke Resolution reopened => fixed
2015-06-09 18:49 Jim Luth Note Added: 0006121
2015-06-09 18:49 Jim Luth Status resolved => closed
2015-06-09 18:49 Jim Luth Fixed in Version => 1.03