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AIXM 5.x (Aeronautical Information Exchange Model XML Version 5.x) Writer Parameters

AIXM Version

ClosedAIXM Version

This parameter defaults to the AIXM v5.1 XML Namespace URI http://www.aixm.aero/schema/5.1/message. This allows the writer to be configured to the AIXM v5.1 schemas without explicitly requiring you to set the .xsd file location with the Application Schema parameter.

Setting this parameter to Other allows you to alternatively provide the AIXM schema file via the Application Schema parameter. The AIXM5 writer will parse the AIXM schema and write out features according to the feature types found in the schema. No other feature types, except the ones specified in the schema, will be written. The writer feature type definitions must then match the ones from the schema.

Importing the feature type definitions from the AIXM5 reader with the same settings will bring in the valid writer feature type definitions accepted by the writer.

Note: When importing feature type definitions to the writer the AIXM5 reader, you can leave the dataset unset.

ClosedApplication Schema

Specifies the location of the AIXM .xsd document.

SRS Parameters

ClosedGML srsName

This parameter can overwrite the CRS value that is written in the GML instance’s srsName attributes.

By default, the FME coordinate system name in a feature is transferred directly onto the srsName attribute. Using this parameter allows you to provide your own URN CRS string for the srsName attributes.

ClosedGML SRS Axis Order

This parameter is required in conjunction with the GML srsName parameter. It specifies the axis order for a coordinate tuple in a GML <pos> or <posList> element.

The valid values are

  • 1,2
  • 2,1
  • 1,2,3
  • 2,1,3

There is no default value.

For example, if GML srsName is set to urn:ogc:def:crs:EPSG:6.6.4326, this parameter should be set to “2,1” so that the coordinates in the GML <pos> and <posList> elements are written in lat-lon order.

Feature Properties – Attribute Handling

ClosedMap Complex Properties as

Specifies whether GML properties that are defined as a complex type with complex content (that is, those that have embedded children elements) should be mapped as nested list attributes within FME features.

If the value is set to XML Fragments, then the complex properties with complex content are mapped as XML fragments.

Some complex properties, such as those that are recursively defined, cannot be mapped as nested lists. These complex properties will always be mapped as XML fragments, regardless of the setting for this parameter.

ClosedLimit Number of Lists in Nested Attributes

This optional parameter can control the depth of nested list attributes.

Pretty Printing

ClosedPretty Print

Setting this parameter to Yes ensures the output is neatly formatted. This promotes easier reading on screen and in print output.

  • Indent Size: Select a value from 0 to 9.
  • Replace Tabs with Spaces: By default the Tab character is used to for indentations. Select Yes to substitute the Tab character with a Space.

Note: Enabling this option produces a considerably larger output file due to added whitespace.

Feature Properties – Attribute Handling

ClosedMap Complex Properties as

Specifies whether GML properties that are defined as a complex type with complex content (that is, those that have embedded children elements) should be mapped as nested list attributes within FME features.

If the value is set to XML Fragments, then the complex properties with complex content are mapped as XML fragments.

Some complex properties, such as those that are recursively defined, cannot be mapped as nested lists. These complex properties will always be mapped as XML fragments, regardless of the setting for this parameter.

ClosedLimit Number of Lists in Nested Attributes

This optional parameter can control the depth of nested list attributes.

Advanced

ClosedMaximum Decimal Places

Specify the maximum number of decimal place to write to the GML file when writing coordinates.

To specify an exact number of decimal places to write, use this parameter in conjunction with the Minimum Decimal Places parameter.

Value

An integer greater than or equal to 0.

Default value: 15 decimal places.

ClosedMinimum Decimal Places

Specify the minimum number of decimal place write to the GML file when writing coordinates.

To specify an exact number of decimal places to write, use this parameter in conjunction with the Maximum Decimal Places parameter.

Value

An integer greater than or equal to 0.

Default value: 0 decimal places.

ClosedSystem Encoding

This parameter specifies the encoding for the incoming schema and data feature (for example, UTF-8).

If unspecified, the writer assumes that the schema and data features are encoded with the system’s encoding.

ClosedSuppress xsi:schemaLocationAttribute

This parameter suppresses the output of the xsi:schemaLocation attribute in the GML instance’s root element. The xsi:schemaLocation in an XML document instance is not a mandatory attribute – it is merely a hint that an XML processor may choose to ignore.

Setting this parameter to Yes suppresses the output of the xsi:schemaLocation attribute in the output GML instance. The default setting is No.

Feature Collection

ClosedFeature Collection

The root collection element is influenced by this parameter.

  • FeatureCollection – In GML 3.1.1 mode, the default collection element is <gml:FeatureCollection>; the Feature Collection NS URI parameter may be used in conjunction with this parameter to change the collection element to <wfs:FeatureCollection>.

Note: <wfs:FeatureCollection> is not supported when writing in GML v3.2.1 mode.

  • target-namespace – Changes the root element to <[target-ns-prefix]:FeatureCollection>, where [target-ns-prefix] is the prefix that is bound to the output document target namespace, e.g., <fme:FeatureCollection>. The output xsd document will also include a custom FeatureCollection declaration and FeatureCollectionType definition.

Feature Collection when GML Version is Application Schema

This parameter can also be used to specify the local-name of the element that should be used as the feature collection only when the GML Version parameter is set to Application Schema. The specified feature collection must exist in the set of parsed schemas, otherwise FeatureCollection in the GML namespace will be assumed.

If the parameter is left empty and if the parent/child relationship for the features in the writer are assembled into several rooted trees, then FeatureCollection will be assumed as the wrapper collection; parent/child relationships are maintained with the gml_id and gml_parent_id attributes. Note that an XML document must have a single rooted element.

If the parameter has the local-name of the element and this element corresponds to a feature collection in the set parsed schemas, and:
  • if the specified collection is passed in as a feature, then the writer will use this feature as the feature collection of the dataset. The parent/child relationships should be set up so that this feature ends up as the single rooted element of the output. If the single rooted tree does not have the same element name as the specified feature collection, then the writer will automatically create the specified feature collection to serve as the root element of the GML output. Note that the writer will also force any features without a gml_parent_id to be children of the specified collection. This means that users may skip the extra step of assigning a gml_parent_id to all features belonging to that collection.
 OR
  • if the specified collection is NOT passed in as a feature, then the writer will automatically create the specified feature collection to serve as the root element of the GML output. Note that this may not be ideal, as the feature collection may have some required properties that the GML writer cannot automatically populate.
ClosedFeature Collection ID

GML v3.2.1 requires a gml:id on every feature and feature collection.

This parameter allows you to supply a custom gml:id value to replace UUID that is automatically assigned for the feature collection under GML v3.2.1.

ClosedFeature Collection NS URI

This parameter is applicable only when the GML Version parameter is set to Application Schema or 3.1.1. It is used to specify the XML Namespace URI for the element name that is specified as the feature collection in the Feature Collection parameter.

For example, to specify the WFS 2.0 "FeatureCollection", set this parameter to "http://www.opengis.net/wfs/2.0" and Feature Collection to the "FeatureCollection" (as specified above, in Feature Collection when GML Version is Application Schema).