Oracle Service Bus, processing Java Object Messages with JMS transport

Oracle Service Bus, processing Java Object Messages with JMS transport.

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XML Schema Versioning – Approach Comparison

Hi Mary.

We had to make this decision about 12 months ago and decided
to use #2 as well as encoding the equivalent information into the
schemaLocation attribute.

This was driven mainly by a reading of section 4.3.2 of the Schema
structures document (as it was then), which implied that toolsets
might end up using the schemaLocation OR the namespace
to locate the schema. We figured we could always
freeze one or the other depending on how the best practices
evolved.

As it turned out, I'm glad we did include the version in the schemaLocation
as most of the tools to date have used this as the mechanism to
pick up the relavent schema.

Regards
Michael

<OffTopic>

I realise the best practices are about schemas but IMHO, the issue of
versioning the XML content needs to be considered as well, for a
versioning scheme to be effective. Naturally, this is domain specific

As an example, we also added a version
attribute on each transaction, within our transaction framework.
The driver here was that the transaction could become
disconnected from the document in which it was delivered, as multiple
transactions directed to multiple backend systems can be delivered
in a single document.

By attaching a version attribute to each transaction,
the backend processing can provide the appropriate logic switch for
different versions, without knowledge of the schema version under which
the transaction was delivered. This version attribute reflects the schema
version
at which the transaction structure last changed. This allows the schema
version
to progress without needing to touch the backend code to track these
changes,
except in the case where the application logic is affected.

</OffTopic>





                                                                                                                   
                    Mary                                                                                           
                    Pulvermacher         To:     xml-dev <xml-dev@lists.xml.org>                                   
                    <pulver@mitre        cc:     mctaylor@ingennia.com.au                                          
                    .org>                Subject:     XML Schemas: Best Practices ? Versioning                     
                                                                                                                   
                    06/09/2001                                                                                     
                    03:50 AM                                                                                       
                                                                                                                   
                                                                                                                   




Hello everyone-


Roger Costello has asked me to initiate this Best Practice topic.  The
results of this discussion will be posted, along with the other Best
Practices, on the Best Practice Homepage (
http://www.xfront.com/BestPracticesHomepage.html).


Topic:  What is the Best Practice for versioning XML schemas?


Is it better to version a schema by:
     1. Changing the (internal) schema version attribute,
     2. Changing the schema's targetNamespace,
     3. Changing the name of the schema, or
     4. Changing the location of the schema?



1. CHANGING THE SCHEMA VERSION ATTRIBUTE
In this approach one would simply change the number in the optional version
attribute at the start of the XML schema.  For example, in the code below
one could change version="1.0" to version="1.1"


<xs:schema  xmlns:xs="http://www.w3.org/2001/XMLSchema"
    elementFormDefault="qualified"
    attributeFormDefault="unqualified"
    version="1.0">


This approach is very easy to use.  Also, no change is needed to the
instance document if it is not affected by the change in the schema.
However, the validator ignores this field.  Therefore, I regard the version
attribute as a cue to the human (especially if their schema doesn't
validate) rather than an enforceable constraint.  This approach could be
used in conjunction with any of the other approaches.



2. CHANGING THE SCHEMA'S TARGET NAMESPACE
In this approach, the 'targetNamespace' attribute at the start of the
schema could be changed to designate that a new version of the schema
exists.  One way to do this is to include a schema version number in the
designation of the target namespace as shown in the example below.


<xs:schema xmlns="http://www.addressGlobalsV1.0"
     targetNamespace="http://www.addressGlobalsV1.0"
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
     elementFormDefault="qualified" attributeFormDefault="unqualified">


Then one could update the version number in the target namespace
designation with each change to the schema.  With this approach, instance
documents will not validate until they are changed to designate the new
targetNamepsace.


A disadvantage of this approach is that it forces all instance documents to
change, even if the change to the schema would not impact that instance.
Also, any schemas that 'include' this schema would have to change because
the target namespace of the included components must be the same as the
target namespace of the including schema.



3. CHANGING THE NAME OF THE SCHEMA
This approach changes the file name of the schema.  This should sound
familiar since most people develop conventions for naming their files so
that they know which version is the most current (e.g., append version
number or date to end of file name).


Since instance documents give the name and location of the associated
schema, the instance documents will not validate until they are changed to
designate the new schema file name.


As with option 2, one disadvantage of this approach is that it forces all
instance documents to change, even if the change to the schema would not
impact that instance.


Also, any schemas that import the modified schema would have to change
since the import statement provides the name and location of the imported
schema.


This approach seems most powerful when used in conjunction with approaches
1 and 4.  For example, one could set up a convention whereby the latest
version of a particular schema is always available in a specific location
under a specific filename.  The version number inside the schema (and any
annotations) could provide details on version number and a change history.
Old versions of the schema may still be made available in an archive.  This
approach seems most feasible to me for implementing XML schema registries.
With this approach, one always knows where to get the latest version but
small changes to the schema would not impact any schemas that 'inherit'
(include or import) the schema.


This mimics an approach taken by the W3C on the XML Schema specification.
For example, the latest version of the "XML Schema Specification Part 0:
Primer" is always called "xmlschema-0".  Previous versions are available
but the file names include a date to distinguish it from the latest
version.



4. CHANGING THE LOCATION OF THE SCHEMA
The last approach is changing the location of schema.  This is very similar
to changing the schema file name and really doesn't seem to make much sense
when used alone.  As mentioned above, a versioning approach that combines
this approach with options 1 and 3 seems powerful.



************ Your Opinion? ************


What is your opinion on the advantages and disadvantages of the respective
approaches?


Which approach do you think works best?


Are there other options I have missed?


Do you have a favorite way of handling schema versioning?  If so, why did
you choose this approach?



Please send your comments.  I'd love to hear from you.


Thanks in advance for your help.
Mary Pulvermacher
--
Mary K. Pulvermacher
The MITRE Corporation
pulver@mitre.org
(719) 572-8241
---------------------------------------------------

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Details & Early Benchmarks of OpenCL accelerated SQLite on ARM Mali

Tom Gall

I’ve done some more tuning over the past couple of days. I’ve also done some reading about how to make OpenCL perform better on ARM Mali.  In this post I’m going to retrace some of my steps, share what my tests looks like, share what some of my OpenCL looks like, share current performance numbers and last discuss next steps.

Gentle Reminder

This is in many ways still a prototype / proof of concept. My early goals are to get a very good sense what the possible performance of an OpenCL accelerated SQLite would be for the general case.  From this prototype I want to be able to iterate to complete implementation.

 Performance Testing the Prototype

I’m comparing the c apis that SQLite provides as well as my own API that I’ve developed. My API works with the same data structures and is compiled with the SQLite source code. I’m…

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Build a Continuous Deployment System with Maven, Hudson, WebLogic Server, and JUnit

Programmatic Ponderings

Build an automated testing, continuous integration, and continuous deployment system, using Maven, Hudson, WebLogic Server, JUnit, and NetBeans. Developed with Oracle’s Pre-Built Enterprise Java Development VM. Download the complete source code from Dropbox and on GitHub.

System Diagram

Introduction

In this post, we will build a basic automated testing, continuous integration, and continuous deployment system, using Oracle’s Pre-Built Enterprise Java Development VM. The primary goal of the system is to automatically compile, test, and deploy a simple Java EE web application to a test environment. As this post will demonstrate, the key to a successful system is not a single application, but the effective integration of all the system’s applications into a well-coordinated and consistent workflow.

Building system such as this can be complex and time-consuming. However, Oracle’s Pre-Built Enterprise Java Development VM already has all the components we need. The Oracle VM includes NetBeans IDE for development, Apache…

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Oracle Service Bus logging & tracing III – Creating a Custom Reporting Provider

J@n van Zoggel

In my earlier blogpost explaining the Oracle Service Bus Report Action I already mentioned the fact that Oracle allows you to create a custom report provider. Quote:

If you do not wish to use the JMS Reporting Provider that is provided with your Oracle Service Bus installation, you can untarget it and create your own reporting provider using the Reporting Service Provider Interface (SPI). If you configure your own reporting provider for messages, no information is displayed in the Oracle Service Bus Administration Console. You must to create your own user interface.

Since the report action places a java object on an internal JMS queue named wli.reporting.jmsprovider.queue we can play around with it from their.

Initially we wanted to discover what information this Java Object contained. So I’ve created a simple EJB project as an example named it CustomOsbReportHandler.

This project was build with WLS/OSB 11.1.1.5 and the project uses…

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Using and Testing Complex Business Rules in Oracle BPM 11g

Oracle Technologies Primer

A Slight Briefing

Oracle Business Rules is a high performance and lightweight business rules product that is part of the Oracle Fusion Middleware Suite that can be used in both SOA and BPM suite.

To have a business process more agile and coherent with the changing demands of Business, Oracle Business rules is a must for any design. Also it should act as a central component where all process rules are located.

With OBR 11g one added advantage of business rules is that they can be exposed as any other web service. This makes it an instant hit as it becomes hot pluggable.

Here in this example blog i would show how to create a complex rule in JDeveloper and test it out through multiple ways. This is intended to be a zero lecture hands on so i would skip the talk.

Prerequisites

  • SOA Suite 11gPS2 or PS3 is installed…

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