GML (WFS 1.1.0 FeatureCollection)

This is a reference documentation of the GML (WFS 1.1.0 FeatureCollection) writer in hale studio. Usually you will not need this reference, as in hale studio the configuration of I/O providers is done via the respective wizards for import and export. Where this reference can come in handy is if you want launch a transformation via the command line.

Configuration parameters

Following are the specific configuration parameters for this writer.

• Custom EPSG prefix

  Prefix to use for all CRS codes based on EPSG in geometry srsNames.

  Setting name	crs.epsg.prefix
  Example value	http://www.opengis.net/def/crs/EPSG/0/
  	Make sure that all SRS names use this kind of notation. The EPSG code number is appended to the provided parameter to build the SRS name.
  	By default the CRS code is not modified.

• Target CRS

  Target coordinate reference system the data should be transformed to.

  Setting name	crs
  Example value	code:EPSG:4326
  	Reference systems can be defined either as code or WKT (preceded with code: or wkt: respectively)
  	By default no CRS transformation is performed, the existing geometries are written with their respective CRS.

• Unification of winding order

  Unifiying the winding order of geometries, before writing them

  Setting name	geometry.unifyWindingOrder
  Example value	clockwise, noChanges
  	Unifying order can be set as Clockwise or no changes in order (clockwise or noChanges respectively).
  Default value	counterClockwise
  	By default, counterClockwise is set for GML instance

• Simplify geometries

  If geometries should be simplified (e.g. a MultiPolygon to a Polygon), if possible, before writing them.

  Setting name	gml.geometry.simplify
  Default value	true

• Pretty print

  If the output should be pretty printed (indented)

  Setting name	xml.pretty
  Default value	false

• Omit unnecessary nilReasons

  Don't encode nilReason attributes for elements that are not nil.

  Setting name	xml.notNil.omitNilReason
  Example value	false
  Default value	true
  	By default, nilReason attributes are omitted for elements that are not nil.

• Add codespace to gml:identifier

  Automatically add codespace to gml:identifier during GML export.

  Setting name	xml.add.codespace
  Example value	false
  Default value	true
  	By default, the codespace is automatically added to the gml:identifier.

• Instances per file

  Guiding value for instances per file. The number will be exceeded only in cases where there are too many inter-related instances that cannot be separated.

  Setting name	instancesPerFile
  Example value	1000
  Default value	0
  	By default, no partitioning will take place and all instances will be written to a single file.

• Partitioning mode

  Mode for partitioning the output

  Setting name	partition.mode
  Example value	cut
  	The partitioning can also be done by cutting strictly at the threshold.
  Default value	related
  	By default objects that are connected via local XML references are kept together.

The following configuration parameters are shared for all I/O providers.

• Content type

  During import the content type is tried to be auto-detected, for export this is not possible, but I/O providers may have a default content type associated. If an I/O provider only supports one content type, it's usually not necessary to set this parameter. In any case you can override the content type to use/assume using a content type identifier (see the list of supported content types at the bottom of the page).

  Setting name	contentType
  Example value	eu.esdihumboldt.hale.io.gml

• Character encoding

  Specifying a character encoding is important especially for the import, so data is interpreted correctly. Not every I/O provider may respect this setting though (e.g. if the encoding is given by the data source).
  Specify a character encoding by its name as recognised by Java.

  Setting name	charset
  Example value	UTF-8

Supported content types

• GML file (eu.esdihumboldt.hale.io.gml)
• GZiped GML file (eu.esdihumboldt.hale.io.gml.gzip)