# Package org.apache.sis.metadata.iso.quality

Information about data quality, accuracy and consistency of a dataset. An explanation for this package is provided in the OpenGIS® javadoc. The remaining discussion on this page is specific to the SIS implementation.
Overview
For a global overview of metadata in SIS, see the `org​.apache​.sis​.metadata` package javadoc.

Package overview
Class hierarchy | Aggregation hierarchy
--- | ---
ISO 19115 metadata `├─` Data quality `├─` Element «abstract» `│ ├─` Completeness «abstract» `│ │ ├─` Completeness commission `│ │ └─` Completeness omission `│ ├─` Logical consistency «abstract» `│ │ ├─` Conceptual consistency `│ │ ├─` Domain consistency `│ │ ├─` Format consistency `│ │ └─` Topological consistency `│ ├─` Positional accuracy «abstract» `│ │ ├─` Absolute external positional accuracy `│ │ ├─` Relative internal positional accuracy `│ │ └─` Gridded data positional accuracy `│ ├─` Temporal accuracy «abstract» `│ │ ├─` Accuracy of a time measurement `│ │ ├─` Temporal consistency `│ │ └─` Temporal validity `│ ├─` Thematic accuracy «abstract» `│ │ ├─` Quantitative attribute accuracy `│ │ ├─` Non quantitative attribute accuracy `│ │ └─` Thematic classification correctness `│ └─` Usability `└─` Result «abstract» `├─` Conformance result `├─` Quantitative result `└─` Coverage result Code list `└─` Evaluation method type | Data quality `├─` Scope `└─` Element «abstract» `├─` Evaluation method type «code list» `└─` Result «abstract» Completeness «abstract» Completeness commission Completeness omission Logical consistency «abstract» Conceptual consistency Domain consistency Format consistency Topological consistency Positional accuracy «abstract» Absolute external positional accuracy Relative internal positional accuracy Gridded data positional accuracy Temporal accuracy «abstract» Accuracy of a time measurement Temporal consistency Temporal validity Thematic accuracy «abstract» Quantitative attribute accuracy Non quantitative attribute accuracy Thematic classification correctness Usability Conformance result Quantitative result Coverage result

Null values, nil objects and collections
All constructors and setter methods accept `null` arguments. A null argument value means that the metadata element can not be provided, and the reason for that is unspecified. Alternatively, users can specify why a metadata element is missing by providing a value created by `NilReason​.createNilObject(Class)`.

Unless otherwise noted in the Javadoc, all getter methods may return an empty collection, an empty array or `null` if the type is neither a collection or an array. Note that non-null values may be `NilObject`s.

Unless the metadata object has been marked as unmodifiable and unless otherwise noted in the Javadoc, all collections returned by getter methods are live: adding new elements in the collection modify directly the underlying metadata object.

Since:
  0.3
See Also:
  SIS-394

Defined in the `sis-metadata` module

- Class Summary
  Class | Description
  --- | ---
  AbstractCompleteness | Presence and absence of features, their attributes and their relationships.
  AbstractElement | Type of test applied to the data specified by a data quality scope.
  AbstractLogicalConsistency | Degree of adherence to logical rules of data structure, attribution and relationships.
  AbstractPositionalAccuracy | Accuracy of the position of features.
  AbstractResult | Type of test applied to the data specified by a data quality scope.
  AbstractTemporalAccuracy | Accuracy of the temporal attributes and temporal relationships of features.
  AbstractThematicAccuracy | Accuracy of quantitative attributes and the correctness of non-quantitative attributes and of the classifications of features and their relationships.
  DefaultAbsoluteExternalPositionalAccuracy | Closeness of reported coordinate values to values accepted as or being true.
  DefaultAccuracyOfATimeMeasurement | Correctness of the temporal references of an item (reporting of error in time measurement).
  DefaultCompletenessCommission | Excess data present in the dataset, as described by the scope.
  DefaultCompletenessOmission | Data absent from the dataset, as described by the scope.
  DefaultConceptualConsistency | Adherence to rules of the conceptual schema.
  DefaultConformanceResult | Information about the outcome of evaluating the obtained value (or set of values) against a specified acceptable conformance quality level.
  DefaultCoverageResult | Result of a data quality measure organising the measured values as a coverage.
  DefaultDataQuality | Quality information for the data specified by a data quality scope.
  DefaultDomainConsistency | Adherence of values to the value domains.
  DefaultFormatConsistency | Degree to which data is stored in accordance with the physical structure of the dataset, as described by the scope.
  DefaultGriddedDataPositionalAccuracy | Closeness of gridded data position values to values accepted as or being true.
  DefaultNonQuantitativeAttributeAccuracy | Accuracy of non-quantitative attributes.
  DefaultQuantitativeAttributeAccuracy | Accuracy of quantitative attributes.
  DefaultQuantitativeResult | Information about the value (or set of values) obtained from applying a data quality measure.
  DefaultRelativeInternalPositionalAccuracy | Closeness of the relative positions of features in the scope to their respective relative positions accepted as or being true.
  DefaultScope | Deprecated. As of ISO 19115:2014, `DQ_Scope` has been replaced by `MD_Scope`.
  DefaultTemporalConsistency | Correctness of ordered events or sequences, if reported.
  DefaultTemporalValidity | Validity of data specified by the scope with respect to time.
  DefaultThematicClassificationCorrectness | Comparison of the classes assigned to features or their attributes to a universe of discourse.
  DefaultTopologicalConsistency | Correctness of the explicitly encoded topological characteristics of the dataset as described by the scope.
  DefaultUsability | Deprecated. Not found in ISO 19115-3:2016 schemas.