Hi Everyone, First of all a big thanks to Sorin and George for helping fix my validation errors that I sent to this list. Secondly, I have tried to apply my (limited) understanding of those fixes to the rest of the XML Schema. I unfortunately can't work through what I think is a complex structure to work out where I need to add the "import" and "include" statements. I have tarred and gzipped the GML and ISO 19139 schema that I am using and made them available at the following URL: http://www-test.ga.gov.au/asdd/work/ISO19139GML.tar.gz I have generated an Oxygen project called smXML.xpr and loaded the following XML Schema into that project: Geometry.xsd TemporalObjects.xsd applicationSchema.xsd bad basicTypes.xsd citation.xsd bad constraints.xsd content.xsd bad dataQuality.xsd bad distribution.xsd bad extent.xsd bad generalFeatureModel.xsd identification.xsd bad maintenance.xsd bad metadataApplication.xsd bad metadataEntity.xsd bad metadataExtension.xsd bad portrayalCatalogue.xsd bad referenceSystem.xsd bad scXMLbase.xsd spatialRepresentation.xsd bad I have also noted which files do not *individually* validate by putting the word "bad" next to the above file list. The Geometry.xsd validates individually. However, if I validate some XML Schema that "import" Geometry.xsd then Geometry.xsd has the following errors: "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:AbstractGeometryType' to a(n) 'type definition' component. Geometry.xsd file:/E:/downloads/ISO19139/2004-08-17/ssXML/Geometry.xsd 37:80" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:AbstractGeometricPrimitiveType' to a(n) 'type definition' component. Geometry.xsd file:/E:/downloads/ISO19139/2004-08-17/ssXML/Geometry.xsd 27:39" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:PointType' to a(n) 'type definition' component. Geometry.xsd file:/E:/downloads/ISO19139/2004-08-17/ssXML/Geometry.xsd 16:91" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:Point' to a(n) 'element declaration' component. Geometry.xsd file:/E:/downloads/ISO19139/2004-08-17/ssXML/Geometry.xsd 20:44" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:_GeometricPrimitive' to a(n) 'element declaration' component. Geometry.xsd file:/E:/downloads/ISO19139/2004-08-17/ssXML/Geometry.xsd 31:58" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:_Geometry' to a(n) 'element declaration' component. Geometry.xsd file:/E:/downloads/ISO19139/2004-08-17/ssXML/Geometry.xsd 41:48" Similarly, if I validate TemporalObjects.xsd there are no errors yet if I validate XML Schema in the project then those XML Schema that "import" TemporalObjects.xsd indicate that TemporalObjects.xsd has the following errors: "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:AbstractTimeObjectType' to a(n) 'type definition' component. TemporalObjects.xsd file:/E:/downloads/ISO19139/2004-08-17/stXML/TemporalObjects.xsd 23:65" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:AbstractTimePrimitiveType' to a(n) 'type definition' component. TemporalObjects.xsd file:/E:/downloads/ISO19139/2004-08-17/stXML/TemporalObjects.xsd 13:38" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:_TimePrimitive' to a(n) 'element declaration' component. TemporalObjects.xsd file:/E:/downloads/ISO19139/2004-08-17/stXML/TemporalObjects.xsd 17:53" "http://www.w3.org/TR/xmlschema-1/#src-resolve E src-resolve: Cannot resolve the name 'gml:_TimeObject' to a(n) 'element declaration' component. TemporalObjects.xsd file:/E:/downloads/ISO19139/2004-08-17/stXML/TemporalObjects.xsd 27:50" I believe that the problem has something to do with the link between the ISO19139 XML Schema files and the GML XML Schema files. I have somehow come to this conclusion because of the following commonly occurring validation error: "E src-resolve: Cannot resolve the name 'gml:......' to a(n) 'type definition' component." Please note that the "......" represents different GML types and elements. "E src-resolve: Cannot resolve the name 'gml:AbstractTimeObjectType' to a(n) 'type definition' component. TemporalObjects.xsd file:/E:/downloads/ISO19139/2004-08-17/stXML/TemporalObjects.xsd 23:65" How can a file be valid and also invalid? Can anyone help me track down which files need the "import" or "include" statements? Thanks. John Hockaday Geoscience Australia GPO Box 378 Canberra ACT 2601 (02) 6249 9735 http://www.ga.gov.au/ john.hockaday@ga.gov.au