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IDProjectCategoryView StatusDate SubmittedLast Update
000562310000-004: ServicesSpecpublic2020-05-06 18:352020-06-16 15:45
ReporterJouni Aro Assigned ToMatthias Damm  
PrioritynormalSeverityminorReproducibilityhave not tried
Status closedResolutionunable to reproduce 
Summary0005623: Usage of default values for Method argument requires clarification
Description

Amendment 3 gives an example for using a default value for a method argument:

"Input1 as a numeric input argument with a HasArgumentDescription Reference to a
DataVariable Variable which provides the default value 42."

later, it is declared that

"The semantic of the HasOptionalInputArgumentDescription ReferenceType – extends the semantic of the HasArgumentDescription ReferenceType to reference optional input arguments of a Method NodeClass. Optional input arguments shall always follow any non-optional input arguments in the InputArguments array. For example, if a method has 3 arguments with 1 being optional then the 3rd argument shall be the optional one."

However, the obvious fact that default values for method arguments are only sensible for optional arguments is not mentioned and the example even contradicts that. Or, if a default value can really be given for any argument, how is the client supposed to call the method - providing Null values? Is this really the intention?

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Jeff Harding

2020-05-14 18:49

developer   ~0012057

In Part 4 Table 65 the description of inputArguments[] states
"If a Method has optional input arguments, these optional input arguments are indicated by the Method’s DefaultInputValues Property. In this case fewer arguments than the total number of input arguments defined may be passed by the Client. The InputArguments and DefaultInputValues Property are defined in Part 3."

This isn't correct as optional input arguments are defined by the use of a HasOptionalInputArgumentDescription reference.

Proper description would be something like "If a Method has optional input arguments, these optional input arguments are indicated by the Method using ’s DefaultInputValues HasOptionalInputArgumentDescription References to metadata describing the HasOptionalInputArgumentDescription Reference Type is defined in Part 3."

Matthias Damm

2020-06-10 19:07

developer   ~0012233

The problem is already fixed in the latest 1.05 version of Part 4.

Checked in OPC 10000-4 - UA Specification Part 4 - Services Draft 1.05.08.docx

Jim Luth

2020-06-16 15:45

administrator   ~0012344

Agreed it was fixed long ago in Virtual F2F.

Issue History

Date Modified Username Field Change
2020-05-06 18:35 Jouni Aro New Issue
2020-05-14 18:49 Jeff Harding Note Added: 0012057
2020-05-14 18:51 Jeff Harding Project 10000-003: Address Space => 10000-004: Services
2020-05-14 18:52 Jeff Harding Assigned To => Matthias Damm
2020-05-14 18:52 Jeff Harding Status new => assigned
2020-06-10 19:07 Matthias Damm Status assigned => resolved
2020-06-10 19:07 Matthias Damm Resolution open => unable to reproduce
2020-06-10 19:07 Matthias Damm Note Added: 0012233
2020-06-14 11:51 Matthias Damm Relationship added related to 0004542
2020-06-14 11:52 Matthias Damm Relationship deleted related to 0004542
2020-06-16 15:45 Jim Luth Status resolved => closed
2020-06-16 15:45 Jim Luth Fixed in Version => 1.05
2020-06-16 15:45 Jim Luth Note Added: 0012344