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GML files are usually a single text file with a GML filename extension (coal_dep.gml). Some may use XML as the filename extension. XML schema documents often accompany GML files that have been translated from some other format (e.g., using the ogr2ogr utility). Example of text in a GML fileGML uses sets of nested tags to define attributes and geometry coordinates: <gml:featureMember> <Coal_Deposits f> <UNKNOWN>0.000</UNKNOWN> <NA>0.000</NA> <ID>2</ID> <ID2>2</ID2> <MARK>7</MARK> <COALKEY>110</COALKEY> <COALKEY2>110</COALKEY2> <ogr:geometryProperty> <gml:Point> <gml:coordinates>78.531,50.694</gml:coordinates> </gml:Point> </ogr:geometryProperty> </Coal_Deposits> </gml:featureMember> Data access/connection method
ogrinfo examplesHere's an example that uses ogrinfo on a single GML file: > ogrinfo /data/gml/coal_dep.gml Had to open data source read-only. INFO: Open of 'coal_dep.gml' using driver 'GML' successful. 1: Coal_Deposits Here's an example that uses ogrinfo to examine the structure of one layer: > ogrinfo -summary /data/gml/coal_dep.gml Coal_Deposits Had to open data source read-only. INFO: Open of 'coal_dep.gml' using driver 'GML' successful. Layer name: Coal_Deposits Geometry: Unknown (any) Feature Count: 266 Extent: (23.293650, 37.986340) - (179.272550, 80.969670) Layer SRS WKT: (unknown) UNKNOWN: Real (0.0) NA: Real (0.0) ID: Integer (0.0) ID2: Integer (0.0) MARK: Integer (0.0) COALKEY: Integer (0.0) COALKEY2: Integer (0.0) LONG: Real (0.0) LAT: Real (0.0) Map file exampleLAYER NAME coal_deposits TYPE POINT STATUS DEFAULT CONNECTIONTYPE OGR CONNECTION "gml/coal_dep.gml" CLASS COLOR 0 0 0 SYMBOL 'circle' SIZE 6 END END |
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