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nyalldawsonnyalldawson
committedNov 2, 2016
[FEATURE[processing] New algorithm to compute geometry by expression
This algorithm updates existing geometries (or creates new geometries) for input features by use of a QGIS expression. This allows complex geometry modifications which can utilise all the flexibility of the QGIS expression engine to manipulate and create geometries for output features.
·
ltr-3_40final-3_0_0
1 parent 5e3bef7 commit f65e770

10 files changed

+411
-2
lines changed
 

‎python/plugins/processing/algs/help/qgis.yaml

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@@ -201,6 +201,11 @@ qgis:fixeddistancebuffer: >
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qgis:frequencyanalysis: >
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This algorithms generates a table with frequency analysis of the values of a selected attribute from an input vector layer
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qgis:geometrybyexpression: >
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This algorithm updates existing geometries (or creates new geometries) for input features by use of a QGIS expression. This allows complex geometry modifications which can utilise all the flexibility of the QGIS expression engine to manipulate and create geometries for output features.
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For help with QGIS expression functions, see the inbuilt help for specific functions which is available in the expression builder.
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qgis:generatepointspixelcentroidsalongline:
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‎python/plugins/processing/algs/qgis/GeometryByExpression.py

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# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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GeometryByExpression.py
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-----------------------
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Date : October 2016
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Copyright : (C) 2016 by Nyall Dawson
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Email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Nyall Dawson'
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__date__ = 'October 2016'
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__copyright__ = '(C) 2016, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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from qgis.core import QgsWkbTypes, QgsExpression, QgsExpressionContext, QgsExpressionContextUtils, QgsGeometry
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.ProcessingLog import ProcessingLog
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from processing.core.parameters import ParameterVector, ParameterSelection, ParameterBoolean, ParameterString
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class GeometryByExpression(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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OUTPUT_GEOMETRY = 'OUTPUT_GEOMETRY'
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WITH_Z = 'WITH_Z'
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WITH_M = 'WITH_M'
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EXPRESSION = 'EXPRESSION'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Geometry by expression')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer')))
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self.geometry_types = [self.tr('Polygon'),
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'Line',
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'Point']
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self.addParameter(ParameterSelection(
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self.OUTPUT_GEOMETRY,
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self.tr('Output geometry type'),
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self.geometry_types, default=0))
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self.addParameter(ParameterBoolean(self.WITH_Z,
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self.tr('Output geometry has z dimension'), False))
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self.addParameter(ParameterBoolean(self.WITH_M,
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self.tr('Output geometry has m values'), False))
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self.addParameter(ParameterString(self.EXPRESSION,
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self.tr("Geometry expression"), '$geometry'))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Modified geometry')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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geometry_type = self.getParameterValue(self.OUTPUT_GEOMETRY)
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wkb_type = None
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if geometry_type == 0:
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wkb_type = QgsWkbTypes.Polygon
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elif geometry_type == 1:
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wkb_type = QgsWkbTypes.LineString
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else:
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wkb_type = QgsWkbTypes.Point
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if self.getParameterValue(self.WITH_Z):
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wkb_type = QgsWkbTypes.addZ(wkb_type)
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if self.getParameterValue(self.WITH_M):
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wkb_type = QgsWkbTypes.addM(wkb_type)
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(
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layer.fields(),
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wkb_type,
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layer.crs())
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expression = QgsExpression(self.getParameterValue(self.EXPRESSION))
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if expression.hasParserError():
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raise GeoAlgorithmExecutionException(expression.parserErrorString())
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exp_context = QgsExpressionContext()
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exp_context.appendScope(QgsExpressionContextUtils.globalScope())
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exp_context.appendScope(QgsExpressionContextUtils.projectScope())
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exp_context.appendScope(QgsExpressionContextUtils.layerScope(layer))
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if not expression.prepare(exp_context):
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raise GeoAlgorithmExecutionException(
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self.tr('Evaluation error: %s' % expression.evalErrorString()))
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, input_feature in enumerate(features):
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output_feature = input_feature
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exp_context.setFeature(input_feature)
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value = expression.evaluate(exp_context)
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if expression.hasEvalError():
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raise GeoAlgorithmExecutionException(
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self.tr('Evaluation error: %s' % expression.evalErrorString()))
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if not value:
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output_feature.setGeometry(QgsGeometry())
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else:
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if not isinstance(value, QgsGeometry):
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raise GeoAlgorithmExecutionException(
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self.tr('{} is not a geometry').format(value))
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output_feature.setGeometry(value)
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writer.addFeature(output_feature)
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progress.setPercentage(int(current * total))
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del writer

‎python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py

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from .RemoveNullGeometry import RemoveNullGeometry
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from .ExtendLines import ExtendLines
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from .ExtractSpecificNodes import ExtractSpecificNodes
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from .GeometryByExpression import GeometryByExpression
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pluginPath = os.path.normpath(os.path.join(
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os.path.split(os.path.dirname(__file__))[0], os.pardir))
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IdwInterpolationZValue(), IdwInterpolationAttribute(),
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TinInterpolationZValue(), TinInterpolationAttribute(),
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RemoveNullGeometry(), ExtractByExpression(), ExtendLines(),
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ExtractSpecificNodes()
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ExtractSpecificNodes(), GeometryByExpression()
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]
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if hasMatplotlib:

‎python/plugins/processing/tests/testdata/expected/geometry_by_expression_line.gfs

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<GMLFeatureClassList>
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<GMLFeatureClass>
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<Name>geometry_by_expression_line</Name>
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<ElementPath>geometry_by_expression_line</ElementPath>
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<!--LINESTRING-->
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<GeometryType>2</GeometryType>
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<SRSName>EPSG:4326</SRSName>
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<DatasetSpecificInfo>
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<FeatureCount>7</FeatureCount>
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<ExtentXMin>0.00000</ExtentXMin>
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<ExtentXMax>12.00000</ExtentXMax>
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<ExtentYMin>-2.00000</ExtentYMin>
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<ExtentYMax>6.00000</ExtentYMax>
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</DatasetSpecificInfo>
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</GMLFeatureClass>
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</GMLFeatureClassList>

‎python/plugins/processing/tests/testdata/expected/geometry_by_expression_line.gml

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<?xml version="1.0" encoding="utf-8" ?>
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<ogr:FeatureCollection
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation=""
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xmlns:ogr="http://ogr.maptools.org/"
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xmlns:gml="http://www.opengis.net/gml">
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<gml:boundedBy>
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<gml:Box>
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<gml:coord><gml:X>0</gml:X><gml:Y>-2</gml:Y></gml:coord>
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<gml:coord><gml:X>12</gml:X><gml:Y>6</gml:Y></gml:coord>
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</gml:Box>
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</gml:boundedBy>
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<gml:featureMember>
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<ogr:geometry_by_expression_line fid="lines.0">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>7,3 10,3 10,4 12,6</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:geometry_by_expression_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_line fid="lines.1">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>0,0 2,0</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:geometry_by_expression_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_line fid="lines.2">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>3,1 3,3 4,3 4,4</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:geometry_by_expression_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_line fid="lines.3">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>4,2 6,2</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:geometry_by_expression_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_line fid="lines.4">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>8,-2 11,-2</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:geometry_by_expression_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_line fid="lines.5">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>7,-2 11,2</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:geometry_by_expression_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_line fid="lines.6">
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</ogr:geometry_by_expression_line>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/expected/geometry_by_expression_point.gfs

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<GMLFeatureClassList>
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<GMLFeatureClass>
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<Name>geometry_by_expression_point</Name>
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<ElementPath>geometry_by_expression_point</ElementPath>
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<!--POINT-->
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<GeometryType>1</GeometryType>
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<SRSName>EPSG:4326</SRSName>
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<DatasetSpecificInfo>
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<FeatureCount>9</FeatureCount>
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<ExtentXMin>1.00000</ExtentXMin>
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<ExtentXMax>9.00000</ExtentXMax>
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<ExtentYMin>-4.00000</ExtentYMin>
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<ExtentYMax>4.00000</ExtentYMax>
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</DatasetSpecificInfo>
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</GMLFeatureClass>
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</GMLFeatureClassList>

‎python/plugins/processing/tests/testdata/expected/geometry_by_expression_point.gml

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<?xml version="1.0" encoding="utf-8" ?>
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<ogr:FeatureCollection
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation=""
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xmlns:ogr="http://ogr.maptools.org/"
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xmlns:gml="http://www.opengis.net/gml">
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<gml:boundedBy>
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<gml:Box>
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<gml:coord><gml:X>1</gml:X><gml:Y>-4</gml:Y></gml:coord>
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<gml:coord><gml:X>9</gml:X><gml:Y>4</gml:Y></gml:coord>
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</gml:Box>
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</gml:boundedBy>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.0">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>2,2</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.1">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>4,4</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.2">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>3,3</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.3">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>6,3</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.4">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>5,2</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.5">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>1,-4</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.6">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>9,0</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.7">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>8,0</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_point fid="points.8">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>1,0</gml:coordinates></gml:Point></ogr:geometryProperty>
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</ogr:geometry_by_expression_point>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/expected/geometry_by_expression_poly.gfs

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<GMLFeatureClassList>
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<GMLFeatureClass>
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<Name>geometry_by_expression_poly</Name>
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<ElementPath>geometry_by_expression_poly</ElementPath>
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<!--POINT-->
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<GeometryType>1</GeometryType>
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<SRSName>EPSG:4326</SRSName>
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<DatasetSpecificInfo>
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<FeatureCount>6</FeatureCount>
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<ExtentXMin>1.65385</ExtentXMin>
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<ExtentXMax>9.00000</ExtentXMax>
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<ExtentYMin>0.00000</ExtentYMin>
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<ExtentYMax>6.50000</ExtentYMax>
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</DatasetSpecificInfo>
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<PropertyDefn>
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<Name>name</Name>
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<ElementPath>name</ElementPath>
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<Type>String</Type>
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<Width>5</Width>
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</PropertyDefn>
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<PropertyDefn>
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<Name>intval</Name>
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<ElementPath>intval</ElementPath>
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<Type>Integer</Type>
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</PropertyDefn>
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<PropertyDefn>
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<Name>floatval</Name>
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<ElementPath>floatval</ElementPath>
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<Type>Real</Type>
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</PropertyDefn>
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</GMLFeatureClass>
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</GMLFeatureClassList>

‎python/plugins/processing/tests/testdata/expected/geometry_by_expression_poly.gml

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<?xml version="1.0" encoding="utf-8" ?>
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<ogr:FeatureCollection
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation=""
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xmlns:ogr="http://ogr.maptools.org/"
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xmlns:gml="http://www.opengis.net/gml">
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<gml:boundedBy>
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<gml:Box>
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<gml:coord><gml:X>1.653846153846154</gml:X><gml:Y>0</gml:Y></gml:coord>
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<gml:coord><gml:X>9</gml:X><gml:Y>6.5</gml:Y></gml:coord>
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</gml:Box>
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</gml:boundedBy>
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<gml:featureMember>
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<ogr:geometry_by_expression_poly fid="polys.0">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>1.653846153846154,2.115384615384615</gml:coordinates></gml:Point></ogr:geometryProperty>
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<ogr:name>aaaaa</ogr:name>
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<ogr:intval>33</ogr:intval>
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<ogr:floatval>44.123456</ogr:floatval>
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</ogr:geometry_by_expression_poly>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_poly fid="polys.1">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>6.0,5.333333333333333</gml:coordinates></gml:Point></ogr:geometryProperty>
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<ogr:name>Aaaaa</ogr:name>
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<ogr:intval>-33</ogr:intval>
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<ogr:floatval>0</ogr:floatval>
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</ogr:geometry_by_expression_poly>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_poly fid="polys.2">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>3.5,6.5</gml:coordinates></gml:Point></ogr:geometryProperty>
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<ogr:name>bbaaa</ogr:name>
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<ogr:floatval>0.123</ogr:floatval>
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</ogr:geometry_by_expression_poly>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_poly fid="polys.3">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>9,0</gml:coordinates></gml:Point></ogr:geometryProperty>
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<ogr:name>ASDF</ogr:name>
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<ogr:intval>0</ogr:intval>
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</ogr:geometry_by_expression_poly>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_poly fid="polys.4">
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<ogr:intval>120</ogr:intval>
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<ogr:floatval>-100291.43213</ogr:floatval>
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</ogr:geometry_by_expression_poly>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:geometry_by_expression_poly fid="polys.5">
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<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>5.080459770114943,0.781609195402299</gml:coordinates></gml:Point></ogr:geometryProperty>
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<ogr:name>elim</ogr:name>
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<ogr:intval>2</ogr:intval>
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<ogr:floatval>3.33</ogr:floatval>
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</ogr:geometry_by_expression_poly>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml

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@@ -1275,4 +1275,49 @@ tests:
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results:
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OUTPUT_LAYER:
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name: expected/extract_specific_nodes_polys.gml
1278-
type: vector
1278+
type: vector
1279+
1280+
- algorithm: qgis:geometrybyexpression
1281+
name: Geometry by expression (point)
1282+
params:
1283+
EXPRESSION: 'translate( $geometry,1,1)'
1284+
INPUT_LAYER:
1285+
name: points.gml
1286+
type: vector
1287+
OUTPUT_GEOMETRY: '0'
1288+
WITH_M: false
1289+
WITH_Z: false
1290+
results:
1291+
OUTPUT_LAYER:
1292+
name: expected/geometry_by_expression_point.gml
1293+
type: vector
1294+
1295+
- algorithm: qgis:geometrybyexpression
1296+
name: Geometry by expression (polygon)
1297+
params:
1298+
EXPRESSION: ' translate( centroid($geometry),1,1)'
1299+
INPUT_LAYER:
1300+
name: polys.gml
1301+
type: vector
1302+
OUTPUT_GEOMETRY: '2'
1303+
WITH_M: false
1304+
WITH_Z: false
1305+
results:
1306+
OUTPUT_LAYER:
1307+
name: expected/geometry_by_expression_poly.gml
1308+
type: vector
1309+
1310+
- algorithm: qgis:geometrybyexpression
1311+
name: Geometry by expression (line)
1312+
params:
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EXPRESSION: ' translate( $geometry,1,1)'
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INPUT_LAYER:
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name: lines.gml
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type: vector
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OUTPUT_GEOMETRY: '1'
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WITH_M: false
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WITH_Z: false
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results:
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OUTPUT_LAYER:
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name: expected/geometry_by_expression_line.gml
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type: vector

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