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

Description of the dataset content. 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 `├─` Content information «abstract» `│ ├─` Feature catalogue `│ ├─` Feature catalogue description `│ └─` Coverage description `│ └─` Image description `├─` Feature type info `├─` Range dimension `│ └─` Sample dimension `│ └─` Band `└─` Range element description Code list `├─` Band definition `├─` Coverage content type `├─` Imaging condition `├─` Polarisation orientation `└─` Transfer function type | Content information «abstract» Feature catalogue description `└─` Feature type info Coverage description `├─` Attribute group `│ ├─` Coverage content type «code list» `│ └─` Range dimension `└─` Range element description Band `├─` Band definition «code list» `├─` Polarisation orientation «code list» `└─` Transfer function type «code list» Image description `└─` Imaging condition «code list»

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

Defined in the `sis-metadata` module

- Class Summary
  Class | Description
  --- | ---
  AbstractContentInformation | Description of the content of a resource.
  DefaultAttributeGroup | Information about content type for groups of attributes for a specific range dimension.
  DefaultBand | Range of wavelengths in the electromagnetic spectrum.
  DefaultCoverageDescription | Information about the content of a grid data cell.
  DefaultFeatureCatalogueDescription | Information identifying the feature catalogue or the conceptual schema.
  DefaultFeatureTypeInfo | Information about the occurring feature type.
  DefaultImageDescription | Information about an image's suitability for use.
  DefaultRangeDimension | Information on the range of each dimension of a cell measurement value.
  DefaultRangeElementDescription | Description of specific range elements.
  DefaultSampleDimension | The characteristic of each dimension (layer) included in the resource.