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Scope: Core (OPC-10000-*) All specs

18 result(s) for FieldMetaData

OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

6.2.3.2.4 FieldMetaData

FieldMetaData This Structure DataType is used to provide the metadata for a field in a DataSet . The FieldMetaData is formally defined in Table 7 . Table 7 - FieldMetaData structure Name Type ... Description FieldMetaData Structure Name String Name of the field. The name shall be unique in the DataSet . Description LocalizedText Description of the field. The default value shall be a null
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

6.2.3.2.3 DataSetMetaDataType

Description of the DataSet . The default value is a null or empty LocalizedText . Fields FieldMetaData[] The metadata for the fields in the DataSet . The FieldMetaData DataType is defined
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

6.2.3.7.1 PublishedData

MetaDataProperties QualifiedName [ ] This parameter specifies an array of Properties to be included in the FieldMetaData created for this Variable . It shall be used to populate the properties element
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

6.2.9.4 DataSetMetaData

DataSetMetaData contains size information. This includes ArrayDimensions and MaxStringLength information in the FieldMetaData and the StructureFields of Structure DataTypes . The verification should be executed at the start
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.4.4.2 NetworkMessage layout

size, order and DataTypes of the fields depend on the settings in the FieldMetaData of the DataSetMetaData associated with the DataSetMessage contained in the NetworkMessage . SecurityHeader The security header shall
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.4.5.11 RawData field encoding

restrictions apply to the RawData field encoding. Fields shall have MaxStringLength defined in the FieldMetaData if the DataType is String or ByteString . Fields shall have arrayDimensions defined in the FieldMetaData
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.5.4.2 VerboseEncoding

ExtensionObjects by omitting UaType and UaTypeId fields with concrete DataType defined in the FieldMetaData . In this case the Variants at the top level are collapsed. Therefore the DataSet fields ... encoded like the fields of a Structure where the fields are described by the FieldMetaData . This includes fields with Enumeration DataTypes which are encoded using verbose Enumeration with the definition
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.3.4.8 Message header

User Property name-value pairs. DataSet fields with the PromotedField flag set in the FieldMetaData fieldFlags are copied into the MQTT header. The FieldMetaData Structure is defined
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

9.1.4.3.2 AddVariables Method

VariablesToAdd . The string shall be used to set the name field in the FieldMetaData that is part of the DataSetMetaData . PromotedFields The flags indicating if the corresponding field is promoted ... flag is used to set the PromotedField flag in the fieldFlags parameter in the FieldMetaData . VariablesToAdd Array of Variables to add to PublishedData and the related configuration settings. Successfully added
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

9.1.4.4.2 ModifyFieldSelection Method

match the SelectedFields . The string is used to set the name field in the FieldMetaData that is part of the DataSetMetaData . PromotedFields The flags indicating if the corresponding field ... match the SelectedFields . The flag is used to set the corresponding field in the FieldMetaData that is part of the DataSetMetaData . SelectedFields The selection of Event fields contained
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

9.1.4.5.2 AddPublishedDataItems Method

VariablesToAdd . The string shall be used to set the name field in the FieldMetaData that is part of the DataSetMetaData . The name shall be unique in the DataSet . FieldFlags ... match the VariablesToAdd . The flag is used to set the corresponding field in the FieldMetaData that is part of the DataSetMetaData . VariablesToAdd Array of Variables to add to PublishedData
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

9.1.4.5.3 AddPublishedEvents Method

match the SelectedFields . The string is used to set the name field in the FieldMetaData that is part of the DataSetMetaData . FieldFlags The field flags assigned to the selected fields ... match the SelectedFields . The flag is used to set the corresponding field in the FieldMetaData that is part of the DataSetMetaData . SelectedFields The selection of Event Fields contained
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

9.1.9.3 SubscribedDataSetMirrorType

derived from the parent Node . The other Attribute values are taken from the FieldMetaData . The properties in the FieldMetaData are created as Properties of the Variable . The DataTypes are created
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

B.3.7 Message header

list of name-value pairs. DataSet fields with the PromotedField flag set in the FieldMetaData fieldFlags are copied into the AMQP header. The FieldMetaData Structure is defined in 6.2.3.2.4 . Promoted
OPC-10000-25 – OPC Unified Architecture - Part 25: Object Serialization

6.3.7 CustomMetaDataProperties Property

interpret the DataSet from the DataSetMessage and can evaluate the Properties field of the FieldMetaData Structure (see OPC 10000-14 ). The CustomMetaDataProperties Property contains an array of KeyValuePairs. The purpose ... KeyValuePairs of the CustomMetaDataProperties Property shall be added to the Properties field in the FieldMetaData Structure representing the SerializedData Variable in the containing DataSetMetaDataType Structure comprising the DataSetMetaData
OPC-10000-25 – OPC Unified Architecture - Part 25: Object Serialization

6.3.8 CustomMetaDataRef Property

value is added to the content of the Properties KeyValuePair array in the FieldMetaData . If the CustomMetaDataProperties and the CustomMetaDataRef Properties are both provided, the contents of both are combined ... Properties KeyValuePair array in the FieldMetaData Structure . Note: As all metadata created by the PubSub mechanism are omitted, the metadata does not contain type information
OPC-10000-25 – OPC Unified Architecture - Part 25: Object Serialization

A.5 Semantic Property Metadata in PubSub Scenarios

Figure A.5 shows how semantic Properties (see 5.3 also) can be added to the FieldMetaData structure (see OPC 10000-14 ) describing the SerializedData Variable if added to a DataSet ... PubSub Subscriber by coding this information into the Properties field of the FieldMetaData structure (see 6.3.7 ). If PubSub is configured accordingly, the information is available for the Subscriber through
OPC-10000-25 – OPC Unified Architecture - Part 25: Object Serialization

A.6 JSON encoding of FieldMetaData Properties

JSON encoding of FieldMetaData Properties Figure A.6 shows the resulting JSON encoding for the Properties field of the FieldMetaData structure according to Figure A.5 in A.5 . The amount of metadata ... metadata from the SerializationScope especially for low-bandwidth requirements. Figure A.6 - JSON encoding of FieldMetaData Properties