Validating GML, and using XPath

[Andrew L]

I have two questions.
1. The GML (Geographic Markup Language) schema never wants to correctly validate. Why is this? The following errors occur in the applcation .xsd file:
Location: 21:70
Description: E src-resolve: Cannot resolve the name 'gml:geometryPropertyType' to a(n) 'type definition' component.
URL: http://www.w3.org/TR/xmlschema-1/#src-resolve

and in the OpenGIS reference schema geometry.xsd the following two errors appear 3 times (one each for MultiPolygonType, MultiLineStringType and MultiPointType)
Location: 297:40
Description: E rcase-RecurseLax.2: There is not a complete functional mapping between the particles.
URL: http://www.w3.org/TR/xmlschema-1/#rcase-RecurseLax

Location: 297:40
Description: E derivation-ok-restriction.5.4.2: Error for type 'MultiPolygonType'. The particle of the type is not a valid restriction of the particle of the base.
URL: http://www.w3.org/TR/xmlschema-1/#deriv ... estriction

2. Whenever I try to specify an XPath in this document I receive a message saying XPath returned no results. Queries I have used include //FeatureCollection and //FeatureCollection/gml:featureMember

<?xml version="1.0" encoding="UTF-8"?>
<FeatureCollection xmlns="http://mydomain/schemas"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:gml="http://www.opengis.net/gml"
xsi:schemaLocation="http://mydomain/schemas event3.xsd">
<gml:boundedBy><gml:Box><gml:coordinates>100,100,100,100</gml:coordinates></gml:Box></gml:boundedBy>
<gml:featureMember>
<event>
<geometryProperty>
<gml:Point>
<gml:coordinates>100,100</gml:coordinates>
</gml:Point>
</geometryProperty>
<siteCode>AL1234</siteCode>
<date>2004-10-10</date>
<locationDescription>Somewhere</locationDescription>
<eventType>Excavation</eventType>
<period>Roman</period>
</event>
</gml:featureMember>
</FeatureCollection>


If anyone can help, I'd be very grateful.

Many thanks

Andrew L

Sysinfo:
oXygen 3.0
Xerces-J 2.6.0
Xalan Java 2.5.1
JVM IBM 1.4.1
Mandrake Linux 9 w/2.4.21 kernel

[george]

Hi Andrew,

1. There are more versions of GML. Please point us to the URLs for the two schemas you mention.

2. When you say //FeatureCollection that means you are referring to the FeatureCollection element from no namespace. In your document the FeatureCollection belongs to "http://mydomain/schemas" namespace.

See http://www.oxygenxml.com/pipermail/oxyg ... 00179.html for more details about this type of problems.

Best Regards,
George