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

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

- Related Packages
  Package
  Description
  org.apache.sis.metadata.iso
  Root package for ISO 19115 metadata about resources (data or services).
- Classes
  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.