DDF Catalog Application Users Guide — Describes the DDF Catalog application and available options for extending its capabilities
- Data Components — representations of data in the Catalog, primarily metadata represented as a Metacard
- Endpoints — components that accept external requests and interface with internal components, normalizing the request and denormalizing the response
- Developing Catalog Components — Describes how to create Catalog components. Used in conjunction with the Javadoc to begin extending the DDF Catalog.
  - Catalog Development Fundamentals — Introduces the fundamentals of working with the Catalog API, including Metacards and use of the OGC Filter for Queries
  - Developing an Endpoint — Describes how to create an Endpoint and the description of methods an Endpoint can invoke.
  - Developing a Catalog Plugin — Describes the different plugins that can be created.
  - Developing a Source — Describes the different types of sources and how to create them.
  - Developing Transformers — Describes the different types of transformers and how to create them.
  - Developing a Resource Reader — Describes how to create a ResourceReader.
  - Developing a Resource Writer
  - Developing a Registry Client — Briefly describes how Registry Clients create Sources within the framework.
- Catalog Plugins — process Catalog operations, generally before and after they are executed
  - Pre-Query Plugin — invoked before a query operation is sent to a Source
  - Post-Query Plugin — invoked after a query has been executed successfully, but before the response is returned
  - Pre-Ingest Plugin — invoked before an ingest operation is sent to a Source
  - Post-Ingest Plugin — invoked after data has been created, updated, or deleted
  - Pre-Get Resource Plugin — invoked before a request to retrieve a resource is sent to a Source
  - Post-Get Resource Plugin — invoked after a resource has been retrieved, but before it is returned
  - Pre-Subscription Plugin — invoked before a Subscription is activated by an Event Processor
  - Pre-Delivery Plugin — invoked before a Delivery Method is invoked on a Subscription
- Resource Components — used to work with Resources, i.e., the data represented by the cataloged metadata
  - Resource Reader — retrieves resources associated with Metacards via URIs
  - Resource Writer — stores a resource and produces a URI that can be used to retrieve the resource later
- DDF Catalog Core
  - Catalog API — The Catalog API is an OSGi bundle that contains the Java interfaces and classes for the DDF Catalog components.
  - Standard Catalog Framework — provides the reference implementation of a Catalog Framework
  - Standard Event Processor — creates and deletes subscriptions, applies the criteria for each subscription to ingest events, and sends events to registered consumers when the criteria is matched
  - URL Resource Reader — obtains a resource given an http, https, or file-based URL
  - Sorted Federation Strategy — the default Federation Strategy which returns results sorted by the sorting parameter specified in the federated query
  - Fanout Event Processor — Event Processor for fanout configuration
  - Metacard Groomer — The Metacard Groomer Pre-Ingest Plugin makes modifications to CreateRequest and UpdateRequest metacards.
- DDF Catalog Application Install/Uninstall
- Catalog Framework — the core of the Catalog application, routes requests and responses between all Catalog Components
- Eventing — allows endpoints (and thus external users) to create a "standing query" and be notified when a matching Metacard is created, updated, or deleted
  - Subscription — represent "standing queries" in the Catalog
  - Delivery Method — provides the operation (created, updated, deleted) for how an event's metacard can be delivered
  - Event Processor — provides an engine that creates, updates, and deletes subscriptions for event notification
- Operations — represent all transactions that occur in the Catalog, including requests and responses
- DDF Catalog REST
  - RESTful CRUD Endpoint — allows clients to perform CRUD operations on DDF using REST, a simple architectural style that performs communication using HTTP.
- Catalog Fanout Framework App — provides an implementation of the Catalog Framework that acts as a proxy, federating requests to all available sources
- Catalog Transformers — transform data to and from various formats
  - XSLT Transformer — allows developers to create light-weight Query Response Transformers and Metacard Transformers using only a bundle header and XSLT files.
  - Included Input Transformers — transforms raw data (text/binary) into a Metacard
  - Included Metacard Transformers — transforms a Metacard into a text/binary format
  - Included Query Response Transformers — transforms a query response containing multiple Metacards into a text/binary format
- DDF Catalog OpenSearch
  - OpenSearch Endpoint — provides a RESTful endpoint that a client accesses to send OpenSearch formatted queries
  - OpenSearch Source — allows the DDF Catalog to federate queries via OpenSearch to a CDR-compliant Search Service
- Federation — provides the capability to extend the DDF enterprise to include Remote Sources, which can include other instances of DDF
  - Federation Strategy — federates a query to all of the Remote Sources in the query's list, processes the results in a unique way, and then returns the results to the client
- Developing at the Framework Level — Help with framework concepts and development.
  - Developing Console Commands
  - Developing Complementary Frameworks
- Sources — connect Catalog components to data sources, both local and remote
  - Catalog Provider — writable data stores that support query, create, update, and delete operations to manage data
  - Remote Sources — read-only data Sources
- DDF Camel Components
  - Catalog Framework Camel Component
- DDF Catalog Schematron
  - Schematron Pre-Ingest Plugin Framework — provides a pre-ingest interceptor that validates the incoming request against a Schematron ruleset (or rule sets)
DDF Catalog Application Release Notes
- Release Version: catalog-2.3.0
DDF Catalog Application Security Guide

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