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I would like to get some suggestions for the mechanics of mapping relational data into XML for situations where the mapping requires grouping of data. QUESTION: When exporting relational data to XML, should: a) the domain model grouping be done by SQL or Java code prior to creating XML data, or b) should XML data be created for each table, then have an application parse the "XML" table documents and write the new desired XML document. c) or ... can transformations be performed (e.g. using something like RELAX) to go from the "XML" table documents to the final single XML document d) or... are any tools available that already handle this situation. Example Given a relational database with three tables: x, y ,z Table x has product information -> one row for each product For example: product-id | product_name | product_manufacturer 123 widget1 manufacturerX 456 widget2 manufacturerY Table y has other product information -> one row for each product For example: product-id | product_type | product_class 123 type1 classX 456 type2 classY Table z has product category - attribute - value information -> multiple rows for each product For example: product-id | product_component | component_attribute | component_value 123 cover material plastic 123 cover color blue 123 cover weight_oz 8 123 base material metal 123 base color gray 123 base weight_oz 6 456 cover material plastic 456 cover color blue 456 cover weight_oz 4 456 base material metal 456 base color gray 456 base weight_oz 7 WANTED: <product> product_id="123"</product_id> product_name="widget1" product_manufacturer="manufacturerX" product_type="type1" product_class="classX" <product_components> <cover material=plastic color="blue" weight_oz="8" /> <base material=metal color="gray" weight_oz="6" /> </product> <product> product_id>456" product_name="widget2" product_manufacturer="manufacturerY" product_type="type2" product_class="classY" product_components> <cover material=plastic color="blue" weight_oz="4" /> <base material=metal color="gray" weight_oz="7" /> </product> Thanks, Jerry =================== Jerry Murray jmurray@i... 650/463-4264
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