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IDProjectCategoryView StatusDate SubmittedLast Update
0005787NodeSets, XSDs and Generated CodeImplementation Bugpublic2020-07-08 10:262020-11-10 17:45
ReporterSendMatt Assigned ToRandy Armstrong  
PrioritynormalSeveritymajorReproducibilityhave not tried
Status closedResolutionno change required 
Summary0005787: Attribute "Value" of DataTypeDictionary in NodeSet files (e.g. "CORE", "DI") seems to be not correct
Description

(I am not sure about this Mantis entry ... if I am wrong pls correct me.)
According to: https://reference.opcfoundation.org/v104/Core/docs/Part5/D.3/
"...
The Server may, but is not required to, make the DataTypeDictionary contents available to Clients through the Value Attribute. Clients should assume that DataTypeDictionary contents are relatively large and that they will encounter performance problems if they automatically read the DataTypeDictionary contents each time they encounter an instance of a specific DataType. The client should use the DataTypeVersion Property to determine whether the locally cached copy is still valid. If the client detects a change to the DataTypeVersion, then it shall re-read the DataTypeDictionary. This implies that the DataTypeVersion shall be updated by a Server even after restart since Clients may persistently store the locally cached copy.

The Value Attribute of the DataTypeDictionary containing the type descriptions is a ByteString whose formatting is defined by the DataTypeSystem. For the “XML Schema” DataTypeSystem, the ByteString contains a valid XML Schema document. For the “OPC Binary” DataTypeSystem, the ByteString contains a string that is a valid XML document. The Server shall ensure that any change to the contents of the ByteString is matched with a corresponding change to the DataTypeVersion Property. In other words, the client may safely use a cached copy of the DataTypeDictionary, as long as the DataTypeVersion remains the same.
..."

Looking at https://github.com/OPCFoundation/UA-Nodeset/blob/DI-1.02.02-2020-06-02/DI/Opc.Ua.Di.NodeSet2.xml
"...
<UAVariable NodeId="ns=1;i=6435" BrowseName="1:Opc.Ua.Di" SymbolicName="OpcUaDi_BinarySchema" DataType="ByteString">
<DisplayName>Opc.Ua.Di</DisplayName>
<References>
<Reference ReferenceType="HasProperty">ns=1;i=6437</Reference>
<Reference ReferenceType="HasProperty">ns=1;i=15893</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=6555</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=15894</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=15897</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=6564</Reference>
<Reference ReferenceType="HasComponent" IsForward="false">i=93</Reference>
<Reference ReferenceType="HasTypeDefinition">i=72</Reference>
</References>
(!!!)) <Value>
<ByteString xmlns="http://opcfoundation.org/UA/2008/02/Types.xsd">PG9wYzpUeXBlRGljdGlvbmFyeQ0KICB4bWxuczpvcGM9Imh0dHA6Ly9vcGNmb3VuZGF0aW9uLm9y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ICAgIDxvcGM6RmllbGQgTmFtZT0iTm9PZk5vZGVQYXRoIiBUeXBlTmFtZT0ib3BjOkludDMyIiAv
Pg0KICAgIDxvcGM6RmllbGQgTmFtZT0iTm9kZVBhdGgiIFR5cGVOYW1lPSJ1YTpRdWFsaWZpZWRO
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YzpTdHJ1Y3R1cmVkVHlwZT4NCg0KPC9vcGM6VHlwZURpY3Rpb25hcnk+</ByteString>
</Value> (!!!)
..."
--> The used value in "Value" property (I have marked them with "(!!!)") at “OPC Binary” DataTypeSystem does not look like "a string that is a valid XML document";
I would have expected to see (TypeDictionary) data here: https://github.com/OPCFoundation/UA-Nodeset/blob/DI-1.02.02-2020-06-02/DI/Opc.Ua.Di.Types.bsd

"...
<UAVariable NodeId="ns=1;i=6423" BrowseName="1:Opc.Ua.Di" SymbolicName="OpcUaDi_XmlSchema" DataType="ByteString">
<DisplayName>Opc.Ua.Di</DisplayName>
<References>
<Reference ReferenceType="HasProperty">ns=1;i=6425</Reference>
<Reference ReferenceType="HasProperty">ns=1;i=15902</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=6539</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=15903</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=15906</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=6548</Reference>
<Reference ReferenceType="HasComponent" IsForward="false">i=92</Reference>
<Reference ReferenceType="HasTypeDefinition">i=72</Reference>
</References>
(!!!)<Value>
<ByteString xmlns="http://opcfoundation.org/UA/2008/02/Types.xsd">PHhzOnNjaGVtYQ0KICB4bWxuczp4cz0iaHR0cDovL3d3dy53My5vcmcvMjAwMS9YTUxTY2hlbWEi
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ZCIgLz4NCg0KICA8eHM6c2ltcGxlVHlwZSAgbmFtZT0iRGV2aWNlSGVhbHRoRW51bWVyYXRpb24i
Pg0KICAgIDx4czpyZXN0cmljdGlvbiBiYXNlPSJ4czpzdHJpbmciPg0KICAgICAgPHhzOmVudW1l
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ZSI+PC94czplbGVtZW50Pg0KDQo8L3hzOnNjaGVtYT4=</ByteString>
</Value>(!!!)
..."
--> The used value in "Value" property (I have marked them with "(!!!)") at “XML Schema” DataTypeSystem does not look like "a valid XML Schema document";
I would have expected to see (TypeDictionary) data here: https://github.com/OPCFoundation/UA-Nodeset/blob/DI-1.02.02-2020-06-02/DI/Opc.Ua.Di.Types.xsd

TagsNo tags attached.
Commit Version
Fix Due Date

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SendMatt

2020-07-08 10:50

reporter   ~0012566

Example for “OPC Binary” DataTypeSystem with binary data (TypeDictionary) of file 'Opc.Ua.Di.Types.bsd' ( https://github.com/OPCFoundation/UA-Nodeset/blob/DI-1.02.02-2020-06-02/DI/Opc.Ua.Di.Types.bsd ) coded as (Hex)String:
"...
<UAVariable NodeId="ns=1;i=6435" BrowseName="1:Opc.Ua.Di" SymbolicName="OpcUaDi_BinarySchema" DataType="ByteString">
<DisplayName>Opc.Ua.Di</DisplayName>
<References>
<Reference ReferenceType="HasProperty">ns=1;i=6437</Reference>
<Reference ReferenceType="HasProperty">ns=1;i=15893</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=6555</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=15894</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=15897</Reference>
<Reference ReferenceType="HasComponent">ns=1;i=6564</Reference>
<Reference ReferenceType="HasComponent" IsForward="false">i=93</Reference>
<Reference ReferenceType="HasTypeDefinition">i=72</Reference>
</References>
(!!!)) 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(!!!)
..."

Randy Armstrong

2020-07-08 10:56

administrator   ~0012567

The value is a ByteString which means base64 encoded UTF8 text.
Copying the contents of the value into this online decoder produces the correct schema as expected:

https://www.base64decode.org/

SendMatt

2020-07-08 11:24

reporter   ~0012568

But according to https://reference.opcfoundation.org/v104/Core/docs/Part6/5.2.2/#5.2.2.7 a "Bytestring" at "OPC UA Binary" is coded as "sequence of bytes preceded by its length in bytes" (which I missed in my example above just like "ByteString" tag):
"...
5.2 OPC UA Binary
[...]
5.2.2.7 ByteString
A ByteString is encoded as sequence of bytes preceded by its length in bytes. The length is encoded as a 32-bit signed integer as described above.

If the length of the byte string is −1 then the byte string is ‘null’.
..."

Base64 encoding should be used for "Bytestring" at "OPC UA JSON":
"...
5.4 OPC UA JSON
[...]
5.4.2.8 ByteString
ByteString values shall be formatted as a Base64 text and encoded as a JSON string.
Any characters which are not allowed in JSON strings are escaped using the rules defined in RFC 7159.
..."

SendMatt

2020-07-08 11:42

reporter   ~0012569

But according to https://reference.opcfoundation.org/v104/Core/docs/Part6/5.2.2/#5.2.2.7 a "Bytestring" at "OPC UA Binary" is coded as "sequence of bytes preceded by its length in bytes" (which I missed in my example above just like "ByteString" tag):
"...
5.2 OPC UA Binary
[...]
5.2.2.7 ByteString
A ByteString is encoded as sequence of bytes preceded by its length in bytes. The length is encoded as a 32-bit signed integer as described above.

If the length of the byte string is −1 then the byte string is ‘null’.
..."

Base64 encoding should be used for "Bytestring" at "OPC UA JSON" or "OPC UA XML" :
https://reference.opcfoundation.org/v104/Core/docs/Part6/5.3.1/#5.3.1.8
"...
5.3 OPC UA XML
[...]
5.3.1.8 ByteString
A ByteString value is encoded as an xs:base64Binary value (see Base64).

The XML schema for a ByteString is:
<xs:element name="ByteString" type="xs:base64Binary" nillable="true"/>
..."

https://reference.opcfoundation.org/v104/Core/docs/Part6/5.4.2/#5.4.2.8
"...
5.4 OPC UA JSON
[...]
5.4.2.8 ByteString
ByteString values shall be formatted as a Base64 text and encoded as a JSON string.
Any characters which are not allowed in JSON strings are escaped using the rules defined in RFC 7159.
..."

SendMatt

2020-07-08 12:25

reporter   ~0012570

... or does http://opcfoundation.org/UA/2008/02/Types.xsd contain the corresponding information for (nodeset) XML files which means I totally mixed up everything:
"...
<xs:element name="ByteString" nillable="true" type="xs:base64Binary" />
..."

Therefor I would like to know then if an OPC UA server does also provide this base64 coded data at "(root)/Types/DataTypes/OPC Binary/Opc.Ua.Di" (Di-namespace i=6435) or according to "OPC UA Binary" as "A ByteString is encoded as sequence of bytes preceded by its length in bytes."?

Randy Armstrong

2020-09-07 20:57

administrator   ~0012760

The NodeSet is an XML document so any values for Variables are encoded using the XML DataEncoding.
When a server creates the address space it is expected to parse the XML encoded value and convert the value to DataType specified by the information Model.
In this case, it is ByteString which contains a UTF-8 encoded XML document.
A server returns a ByteString containing a base64 encoded XML document is wrong.

Jim Luth

2020-11-10 17:45

administrator   ~0013168

Agreed to no-fix.

Issue History

Date Modified Username Field Change
2020-07-08 10:26 SendMatt New Issue
2020-07-08 10:50 SendMatt Note Added: 0012566
2020-07-08 10:56 Randy Armstrong Assigned To => Randy Armstrong
2020-07-08 10:56 Randy Armstrong Status new => resolved
2020-07-08 10:56 Randy Armstrong Resolution open => no change required
2020-07-08 10:56 Randy Armstrong Note Added: 0012567
2020-07-08 11:24 SendMatt Status resolved => feedback
2020-07-08 11:24 SendMatt Resolution no change required => reopened
2020-07-08 11:24 SendMatt Note Added: 0012568
2020-07-08 11:42 SendMatt Note Added: 0012569
2020-07-08 11:42 SendMatt Status feedback => assigned
2020-07-08 12:25 SendMatt Note Added: 0012570
2020-09-07 20:57 Randy Armstrong Status assigned => resolved
2020-09-07 20:57 Randy Armstrong Resolution reopened => no change required
2020-09-07 20:57 Randy Armstrong Note Added: 0012760
2020-11-10 17:45 Jim Luth Status resolved => closed
2020-11-10 17:45 Jim Luth Note Added: 0013168