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EclipseLink/Development/ProjectXMLSchemaValidation
Schema Validation
EclipseLink 'native' Project XML is described in the EclipseLink jar in xsd\eclipselink_persistence_map_1.0.xsd, along with the previous TopLink versions in xsd\toplink-object-persistence_1x_y_z.xsd.
When a Project XML file is read in, EclipseLink attempts to validate it against the above schemas. However, schema validation in Java has mostly been a 'hit-&-miss' affair, with different XML parsers providing very different results. Of specific interest is the use of org.xml.sax.EntityResolver's to manage the lookup of xsds. The callback is:
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException
For example, the Oracle V2 XML Parser populates the systemId argument with a relative-path to the xsd directory in the eclipselink.jar file; however, the Xerces parser provided with Sun's JDK 1.5 populates it with a fully-resolved path. In addition, if the schema to-be-resolved imports another schema, then this second-level of resolving does not work with either parser.