FDO API Reference

Feature Data Objects

define_pages.h

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/*! \mainpage Introduction
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<p>The Feature Data Objects (FDO) application
programming interface (API) is a set of APIs used to
manipulate, define, and analyze geospatial information.
</p>
<p>FDO supports the retrieving and updating of spatial and non-spatial
GIS feature data through a rich classification model that is
based on OpenGIS and ISO standards.
</p>
<p>From the perspective of a client application user: the FDO API 
provides consistent access to feature data,
whether it comes from a CAD-based data source, or from a
relational data store that supports rich classification. To
achieve this, FDO supports a model that can readily follow
the capabilities of each data source, allowing for consumer
applications functionality that is tailored to match that of
the data source. For example, some data sources may support
spatial queries, while others do not. Also, a flexible
metadata model is required in FDO, allowing clients to adapt
to the underlying feature schema exposed by each data source.
</p>
<p>From the perspective of a client application engineer: the
FDO API provides a common, general purpose abstraction layer
for accessing geospatial data from a variety of data sources.
The API is, in part, an interface specification of the
abstraction layer. A provider, such as FDO Provider for SDF, is
an implementation of the interface for a specific type of
data source, which in this example is an implementation for 
Autodesk's spatial database format
(SDF). The API can support the standard data store
manipulation operations, such as querying, updating, versioning,
locking, and others, only when the underlying data store has
the same capabilities for these operations.
</p>
<h2>
  Architecture
</h2>

<p>
The high-level architecture of FDO comprises feature
providers that plug into an application to expose a
consistent feature schema and a consistent interface for
interacting with geospatial feature data, regardless of the
underlying data store. The client applications interact
through the various FDO interfaces, such as
FdoIConnection or FdoICommand, using an FDO interface layer, or feature
access manager.
</p>
<p>
FDO is assembled in or consists of conceptual packages of similar
functionality. This packaging is reflected in the
substructure of the FDO SDK 'includes' folder. FDO commands,
provider-specific commands, and connections/capabilities
provide access to native data stores through each specific
FDO provider. Schema management (using XML), client services,
and filters/expressions are all provider-independent packages
that connect directly to the FDO API.
</p>
<p>
For more information, see <i>The Essential FDO</i> (FET_TheEssentialFDO.pdf) 
and the <i>FDO Developer's Guide</i> (FDG_FDODevGuide.pdf).
</p>

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