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import module namespace geo = "http://expath.org/ns/geo";
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declare namespace gml="http://www.opengis.net/gml";
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declare default element namespace "http://www.adv-online.de/namespaces/adv/gid/4.0";
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geo:envelope((fn:doc("gmlsf_data2.xml")/gml:FeatureCollection/gml:featureMember/AX_Strassenachse/position/gml:Curve)[1])