Object-oriented tools for XML Schema

• JAXB (Java Architecture for XML Binding)– object connectivity for XML documents

• HyperJAXB– relational persistence for XML data

• jaxb-verification– object-level validation

JAXB

• Generates content classes based on the XML Schema

• Provides XML/objects exchange infrastructure– XML documents may be automatically

unmarshalled into object structures – Object structures may be automatically

serialized into XML

JAXB - Example

// Load metadata object structure

// from the XML document

Metadata metadata =

(Metadata) unmarshaller.unmarshal(document);

// Serialize metadata object structure

// into DOM document

Document newDocument = documentBuilder.newDocument(); marshaller.marshal(metadata, newDocument);

HyperJAXB

• Provides JAXB objects with relational persistence layer

• Automatically generates:– Database schema– Object-relational mapping for JAXB objects

HyperJAXB Example – The Schema (1)

• Excerpt from ISO 19115 XML Schema

• Metadata, identification information, bounding box elements

HyperJAXB Example – The Generated Object Structure (2)

HyperJAXB Example –The Generated Database Schema (3)

HyperJAXB Example –The Sample XML (4)

<metadata xmlns="http://www.fzi.de/dbs/tests/iso19115">

<fileIdentifier>id000001</fileIdentifier>

<language>en</language>

<hierarchyLevel>dataset</hierarchyLevel>

<hierarchyLevel>series</hierarchyLevel>

<identificationInfo>

<abstract>The abstract.</abstract>

<purpose>The purpose.</purpose>

<status>planned</status>

<geographicBox>

<extentTypeCode>true</extentTypeCode>

<westBoundLongitude>11.7254223679</westBoundLongitude>

<eastBoundLongitude>11.8123425682</eastBoundLongitude>

<southBoundLatitude>48.3282639631</southBoundLatitude>

<northBoundLatitude>48.4438272635</northBoundLatitude>

</geographicBox>

</identificationInfo>

</metadata>

HyperJAXB Example –The Insertion SQL (5)

INSERT INTO EXGEOGRAPHICBOUNDINGBOX VALUES('...0003',true,48.4438272635,48.3282639631,11.8123425682,11.7254223679)

INSERT INTO MDIDENTIFICATION VALUES('...0002','planned','The purpose.','...0003','The abstract.')

INSERT INTO MDMETADATA VALUES('...0001','id000001','en','...0002')

INSERT INTO METADATA VALUES('...0001')

INSERT INTO MDMETADATA_HIERARCHYLEVELINTERNAL VALUES('...0001','dataset',0)

INSERT INTO MDMETADATA_HIERARCHYLEVELINTERNAL VALUES('...0001','series',1)

HyperJAXB – Live Demo