ChannelDefinition Represents a channel definition in a PQDIF file. The channel definition resides within a and defines a .

 ChannelInstance Represents a channel instance in a PQDIF file. A channel instance resides in an , and is defined by a inside the observation record's .

 ChannelSetting Represents a channel setting in a PQDIF file. A channel setting resides in an , and is defined by a inside the observation record's .

 ContainerRecord Represents the container record in a PQDIF file. There can be only one container record in a PQDIF file, and it is the first physical .

 DataSourceRecord Represents a data source record in a PQDIF file. The data source record contains information about the source of the data in an .

 LogicalParser Represents a parser which parses the logical structure of a PQDIF file.

 LogicalWriter Represents a writer used to create files using the PQDIF file format.

 MissingTag Represents an exception

 MonitorSettingsRecord Represents a monitor settings record in a PQDIF file.

 ObservationRecord Represents an observation record in a PQDIF file.

 SeriesDefinition Definition of a .

 SeriesInstance Represents an instance of a series in a PQDIF file. A series instance resides in a and is defined by a .

 Phase Phase types.

 QuantityMeasured Physical quantity under measurement.

 QuantityUnits Units of data defined in a PQDIF file.

 StorageMethods Defines flags that determine the how the data is stored in a series instance.

 TriggerMethod Type of trigger which caused the observation.

 DataSourceType Types of data sources.

 Equipment Power quality equipment and software.

 QuantityCharacteristic Specifies additional detail about the meaning of the series data.

 QuantityType The high-level description of the type of quantity which is being captured by a channel.

 SeriesValueType Defines tags used to identify different series value types.

 Vendor Vendors for power quality hardware.