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# Introduction

pycsw is an OGC CSW server implementation written in Python.

# Features

- certified OGC Compliant and OGC Reference Implementation
- harvesting support for WMS, WFS, WCS, WPS, WAF, CSW, SOS
- implements INSPIRE Discovery Services 3.0
- implements ISO Metadata Application Profile 1.0.0
- implements FGDC CSDGM Application Profile for CSW 2.0
- implements the Search/Retrieval via URL (SRU) search protocol
- implements Full Text Search capabilities
- implements OpenSearch
- supports ISO, Dublin Core, DIF, FGDC and Atom metadata models
- CGI or WSGI deployment
- simple configuration
- transactional capabilities (CSW-T)
- flexible repository configuration
- GeoNode connectivity
- Open Data Catalog connectivity
- CKAN connectivity
- federated catalogue distributed searching
- realtime XML Schema validation
- extensible profile plugin architecture

## Standards Support

Standard | Version(s)
--- | ---
OGC CSW | 2.0.2
OGC Filter | 1.1.0
OGC OWS Common | 1.0.0
OGC GML | 3.1.1
OGC SFSQL | 1.2.1
Dublin Core | 1.1
SOAP | 1.2
ISO 19115 | 2003
ISO 19139 | 2007
ISO 19119 | 2005
NASA DIF | 9.7
FGDC CSDGM | 1998
SRU | 1.1
A9 OpenSearch | 1.1

## Supported Operations

Request | Optionality | Supported | HTTP method binding(s)
--- | --- | --- | ---
GetCapabilities | mandatory | yes | GET (KVP) / POST (XML) / SOAP
DescribeRecord | mandatory | yes | GET (KVP) / POST (XML) / SOAP
GetRecords | mandatory | yes | GET (KVP) / POST (XML) / SOAP
GetRecordById | optional | yes | GET (KVP) / POST (XML) / SOAP
GetRepositoryItem | optional | yes | GET (KVP)
GetDomain | optional | yes | GET (KVP) / POST (XML) / SOAP
Harvest | optional | yes | GET (KVP) / POST (XML) / SOAP
Transaction | optional | yes | POST (XML) / SOAP

Note

Asynchronous processing supported for GetRecords and Harvest requests (via `csw:ResponseHandler`)

Note

Supported Harvest Resource Types are listed in Transactions

## Supported Output Formats

- XML (default)
- JSON

## Supported Output Schemas

- Dublin Core
- ISO 19139
- FGDC CSDGM
- NASA DIF
- Atom

## Supported Sorting Functionality

- ogc:SortBy
- ascending or descending
- aspatial (queryable properties)
- spatial (geometric area)

## Supported Filters

### Full Text

- csw:AnyText

### Geometry Operands

- gml:Point
- gml:LineString
- gml:Polygon
- gml:Envelope

Note

Coordinate transformations are supported

### Spatial Operators

- BBOX
- Beyond
- Contains
- Crosses
- Disjoint
- DWithin
- Equals
- Intersects
- Overlaps
- Touches
- Within

### Logical Operators

- Between
- EqualTo
- LessThanEqualTo
- GreaterThan
- Like
- LessThan
- GreaterThanEqualTo
- NotEqualTo
- NullCheck

### Functions

- length
- lower
- ltrim
- rtrim
- trim
- upper

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