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

package org.apache.sis.metadata.iso.lineage
Information about the sources and production processes 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 `├─` Lineage `├─` Process step `├─` Source `├─` Nominal resolution `├─` Processing `├─` Algorithm `└─` Process step report | Lineage `├─` Source `│ └─` Nominal resolution `└─` Process step `├─` Source `├─` Processing `│ └─` Algorithm `└─` Process step report

## Null values, nil objects and collections

All constructors and setter methods accept `null` arguments. A null argument value means that the metadata element cannot 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

- Related Packages
  Package
  Description
  org.apache.sis.metadata.iso
  Root package for ISO 19115 metadata about resources (data or services).
- Classes
  Class
  Description
  DefaultAlgorithm
  Details of the methodology by which geographic information was derived from the instrument readings.
  DefaultLineage
  Information about the events or source data used in constructing the data specified by the scope or lack of knowledge about lineage.
  DefaultNominalResolution
  Distance between consistent parts of (centre, left side, right side) adjacent pixels.
  DefaultProcessing
  Comprehensive information about the procedure(s), process(es) and algorithm(s) applied in the process step.
  DefaultProcessStep
  Information about an event or transformation in the life of a resource.
  DefaultProcessStepReport
  Report of what occurred during the process step.
  DefaultSource
  Information about the source data used in creating the data specified by the scope.