XML Daily Newslink. Friday, 09 March 2007

[Robin Cover <robin@oasis-open.org>]

XML Daily Newslink. Friday, 09 March 2007
A Cover Pages Publication http://xml.coverpages.org/
Provided by OASIS http://www.oasis-open.org
Edited by Robin Cover

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This issue of XML Daily Newslink is sponsored by
IBM Corporation  http://www.ibm.com

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HEADLINES:

* CURIE Syntax 1.0: A Syntax for Expressing Compact URIs
* Globus Announces First Escalation, Welcomes Six New Incubator Projects
* Usage Schemas to Tame ODF and OpenXML Down-Conversions
* Reevaluating XSLT 2.0
* Mike Milinkovich on What Eclipse Sees in OSGi
* Open-Source Architected Model-Driven Development in the Real World
* Desktop Matters Conference: Java Swing Technologies Highlighted
* CSS Text Level 3
* DOA with SOA

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CURIE Syntax 1.0: A Syntax for Expressing Compact URIs
Mark Birbeck and Shane McCarron (eds), W3C Technical Report

The W3C HTML Working Group and the W3C Semantic Web Best Practices and
Deployment Working Group jointly have published the First Public
Working Draft for "CURIE Syntax 1.0: A Syntax for Expressing Compact
URIs."  The aim of this document is to outline a syntax for expressing
URIs in a generic, abbreviated syntax.  While it has been produced in
conjunction with the HTML Working Group, it is not specifically targeted
at use by XHTML Family Markup Languages.  Note that the target audience
for this document is Markup Language designers, not the users of those
Markup Languages. More and more grammars are expressing URIs in XML
using QNames. Since QNames are invariably shorter than the URI that they
express, this is obviously a very useful device. However, a major
problem is that the origin of the notion of a QName is such that it does
not allow all possible URIs to be expressed. A specific example of the
problem this causes comes from the IPTC. They would like to be able to
use attributes in their mark-up to carry metadata in their documents,
and as a consequence sought to make extensive use of QNames to keep the
amount of data being transferred as small as possible. In other words,
instead of sending lots of long URIs, QNames were to be used to
abbreviate them. However, the purpose of QNames in XML is to provide a
way for XML elements that contain a colon to be interpreted as an
element with a different name. For example, 'iptc:10112244'  is not a
valid QName simply because '10112244' is not a valid element name. Yet,
in the IPTC example given, the whole reason for using a QName was to
abbreviate the URI, and not to create a namespace qualified element
name. This gives rise to an interesting problem; the definition of a
QName insists on the use of valid XML element names, but an increasingly
common use of QNames is as a means to abbreviate URIs, and unfortunately
the two are in conflict with each other. This specification addresses
the problem by creating a new data type whose purpose is specifically
to allow for the abbreviation of URIs in exactly this way. This type
is called a "CURIE" or a "Compact URI", and QNames are a subset of this.
A CURIE is comprised of two components, a prefix and a suffix. The
prefix is optional. When the prefix is supplied, it is separated from
the suffix by a colon (:). To disambiguate a CURIE when it appears in
a context where a normal URI may also be used, the entire CURIE is
permitted to be enclosed in brackets ([, ]). The document is considered
not yet stable, but has had extensive review over the last eight months.
It is being released in a separate, stand-alone specification in order
to speed its adoption and facilitiate its use in various specifications.

http://www.w3.org/TR/2007/WD-curie-20070307/
See also W3C Semantic Web Activity: http://www.w3.org/2001/sw/

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Globus Announces First Escalation, Welcomes Six New Incubator Projects
Staff, Globus Alliance

Globus recently announced that the GridWay Metascheduler project has
completed incubation and is now a full Globus project. GridWay
gives end users, application developers, and managers of Globus
infrastructures a scheduling functionality similar to that found on
local resource management systems. It uses GRAM for local job
submission, MDS to discover resources, and GridFTP and RFT for job
staging. Functionality includes advanced scheduling capabilities,
detection and recovery from remote and local failure situations , the
ability to submit, monitor, synchronize and control single, array, and
interdependent jobs, the capability to monitor Globus resources and
users, and functionality to extract Grid accounting information.
Gridway has full support for the C and JAVA DRMAA GGF standard for the
development of distributed applications on Globus services. In
addition, six new projects have joined the dev.globus incubation
process, bringing the total number of projects to twenty-two.  The six
new projects include: (1) Workflow Enactment Engine Project (WEEP) -
aims to implement an easy to use and manage workflow enactment service
for WS-I/WSRF services and orchestrate the services as described by
Web Services Business Process Execution Language (WSBPEL) compliant
document; the workflow engine is built up of several components that
collectively represent the core architecture and follows the
recommendations of the Workflow Reference Model. (2) OGRO (Open Grid
Ocsp) is an Incubator project that adds support for the Online
Certificate Status Protocol (RFC 2560) to the Globus Toolkit;  OGRO
is 100% Java and can be easily configurable through the Grid Validation
Policy (GVP), a set of XML rules that mandates its behavior. (3) Data
Distribution Manager (DDM) is an Incubator project that provides an
efficient data distribution service for tracking, transporting and
synchronizing large-scale, distributed data sets. (4) The Gavia
Metascheduler (Gavia-MS) is an Incubator project that implement a
metascheduler exposed as a web service. This is achieved by using the
Globus Toolkit 4 as the grid middleware and Condor for its matchmaking
capabilities. (5) The Gavia Job Submission Client (Gavia-JSC) is an
Incubator project that implements a generic graphical user interface
for job submission, monitoring and management that is tailored to
work with a Globus 4 grid running the Gavia Metascheduler (Gavis-MS).
(6) SJTU GridFTP GUI Client (SGGC) is an interactive GUI client for
GridFTP.

http://dev.globus.org/wiki/Incubator/Incubator_AnncMar7
See also WEEP Version 1.0: http://weep.gridminer.org/index.php/WEEP_Version_1.0

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Usage Schemas to Tame ODF and OpenXML Down-Conversions
Rick Jelliffe, O'Reilly Articles

Kitchen-sink standards are developed by committees and have to cope
with a wide variety of different applications. If someone's software
does something, there has to be some element or attribute or value
stuck in. Sometimes the backdoor of properties (open ended value lists)
is used, so that the schema can be simplified at the expense of
enumerating possible values. But schemas like DOCBOOK, TEI, ODF, and
OpenXML are classic kitchen sinks. There is an objective way to detect
them: check their 'Structured Document Complexity Metric' (online) and
if it is over 300, you probably have a kitchen sink. I gave some
metrics earlier in Comparing Office Document Formats. Now the trouble
with kitchen-sink schemas is that any particular set of documents will
only use a subset of the total possible features. So writing a complete
converter that accepts any possible input from a kitchen-sink schema
and outputing them to some more targetted document type is a completely
wasteful process. YAGNI. But, and here's the rub, every so often,
someone will in fact use one of these strange often, someone will in
fact use one of the elements you didn't expect. One way to cope with
this is the usage schema. This is a schema derived from sampling
representative documents. When new documents come in, you first validate
them against the usage schema, and if there is a problem, escalate it
to the roject management to schema, and if there is a problem, escalate
it to the roject management to discuss how to handle it. It is a sign
that the data is not what they expected. There are some tools to
generate XSD usage schemas, but you can also generate them using
Schematron. The tool I use first generates all three-level Xpaths found
in the document, then makes a Schematron schema that reports if any
node was found that was not caught by these XPaths. Very straightforward,
but effective. Another use for usage schemas is for software development.

http://www.oreillynet.com/xml/blog/2007/03/usage_schemas_to_tame_odf_and.html
See also Complexity Metrics: http://www.oreillynet.com/xml/blog/2006/05/metrics_for_xml_projects_5_str_1.html

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Reevaluating XSLT 2.0
Kurt Cagle, O'Reilly Articles

About XSLT 2.0 increasingly being used as a 'router' language,
replacing such applications as Microsoft's BizTalk Server: "
This is not a disparagement of BizTalk -- it's actually one of the
Microsoft technologies that I have actually endorsed on a regular
basis, because it solves one of the thornier issues involved in
creating complex data systems -- how do you handle the intermediation
of data coming from different data sources, and while I have some
quibbles about the interface, I think BizTalk does its job admirably.
It also served as a bridge technology for quite some time between
the SQL and XML worlds, and it will continue to serve in that role
for quite some time to come... In an AJAX oriented system, such
invocations could (and generally should) be done asynchronously --
the first XSLT passes the initially processed XML to a second
asynchronous transformation using result-document, which would then
be retrieved as a message from a set of queued messages. In this
particular case, the effective routing could be done solely within
the first XSLT, with little need to create multiple synchronous
chains of transformations, though its likely that the resulting
transformation would need to include a link to the message queue to
be queried for responses, possibly with a transaction identifier --
likely using the new XPath current-dateTime(). Such a system is a
routing system -- you are using the XSLT as a router for XML messages
to be sent to the appropriate internal services, where each of those
systems in turn exist either as URLS or as named extensions. That
it also can serve as a validation system is not accidental -- one
of the powers of XML is that you can check for the validity of XML
without the danger of instantiating the object in live form... XSLT
2.0 is able to assume a much more extensive work-horse mode than it
has previously. Most of these modes have already been explored with
older extended XSLT 1.0 processors, but because such implementations
tended to differ in critical areas developers and IT managers tended
to shy away from them for all but very specialized applications.

http://www.oreillynet.com/xml/blog/2007/03/reevaluating_xslt_20.html
See also XSLT Version 2.0: http://www.w3.org/TR/xslt20

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Mike Milinkovich on What Eclipse Sees in OSGi
Rich Seeley, SearchWebServices.com

At EclipseCon 2007, Mike Milinkovich, executive director of the
Eclipse Foundation, headlined his press conference with a technical
talk titled "The Importance of OSGi." The Open Service Gateway
initiative has been the foundation of the Eclipse platform since the
early part of this decade, before there was an Eclipse Foundation or
an EclipseCon. As evidence of this close relationship, the OSGi
Developer Conference is being co-located at EclipseCon in Santa Clara
this week. In an interview [here excrepted], Milinkovich explained why
OSGi, with its roots in embedded systems and computer games, is
something enterprise developers working with Eclipse frameworks and
tools need to pay attention to it. His talk opened with a slide
showing the OSGi implementation in Eclipse Equinox underlying not
only enterprise applications, but also service-oriented architecture
and Rich Internet Applications (RIA) including Ajax. Milinkovich:
"OSGi is a standards organization that started in 1999 around Java
and initially set-top boxes. It's additionally evolved into mobile
automotive applications and it recently started an enterprise expert
group. We're seeing additional uptake OSGi in the middleware space as
well... Quite a few middleware companies are starting to build
middleware stacks on top of OSGi. IBM WebSphere 6.1 is built on top
of Equinox, which is our implementation of OSGi. BEA announced their
micro-server architecture (MSA), which is also based on OSGi. You
are starting to see greater adoption in the server stacks from these
various vendors... The Eclipse plug-in is an implementation of the
OSGi bundle specification. That's where the synergy exists between
the two organizations. OSGi is the standards organization. Eclipse
is an open source organization that provides an implementation of the
standard. Obviously, the synergy between open source and open standards
is something that is one of the major change agents in software today.

http://searchwebservices.techtarget.com/qna/0,289202,sid26_gci1246594,00.html
See also the press release: http://www.eclipse.org/org/press-release/20070306eclipsecommunity.php

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Open-Source Architected Model-Driven Development in the Real World
Steve Andrews and Stosh Misiaszek, IBM developerWorks

This article narrates how Number Six Software used Model Driven
Development techniques to provide the United States' Veterans
Administration with a health services portal that realized significant
cost and quality improvements. The OMG MDA concept provides for the
transformation of a platform-independent model (PIM) that describes the
business concerns of the application into a platform-specific model
(PSM) that describes how the application will be implemented. The target
platform is typically described in terms related to the implementation
language and a technical framework on top of that. J2EE is an example
of a technical framework that consists of a series of interfaces in the
Java programming language. Architected Model-Driven Development (AMDD)
is a strategy that leverages the strengths of both application frameworks
and MDA techniques. The general premise is that a model defines the
entities and services of the application, and that model gets
transformed to a PSM that is based on a combination of a technical
framework and an application framework.  Atlas provides a common way to
model the primary concerns of an application: the maintained state
(entities) and the exposed behavior (services). This model is also known
as the application metadata. It is defined using XML, and it is based
on the OMG Meta-Object Facility (MOF) and the Unified Modeling Language
(UML). For the initial versions of Atlas, the decision was made to use
the XML metadata-based approach in order to force more rigor in adhering
to the modeling conventions required by the Atlas transformation engine.
Model validations at this point are primarily syntactic in nature and
revolve around validation against a series of XML Document Type
Definitions (DTD). In the future, UML profiles and associated model
validations may emerge in order to support visual modeling. The primary
difference between Atlas models and those of other MDA solutions is one
of abstraction. One of the goals of Atlas is to unburden the application
developer from as much of the underlying architectural mechanisms as
possible.

http://www-128.ibm.com/developerworks/rational/library/feb07/andrews_misiaczek/index.html
See also OMG Model Driven Architecture (MDA): http://xml.coverpages.org/omg-mda.html

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Desktop Matters Conference: Java Swing Technologies Highlighted
Paul Krill, InfoWorld

A potpourri of Java client application technologies is on the agenda
at the Desktop Matters Conference. Again dominating the discussion
are technologies pertaining to the Swing desktop client platform for
Java. Presentations are featured on such projects as the Spring Rich
Client Project, jMatter, and SwiXml. The desktop can be a better
option than the Web in some circumstances, one attendee said. "For
certain types of applications, desktop's the only way to go," said
Rob Abbe, chief software architect at Captovation, which develops
document capture software. He cited applications that need to
interface with peripherals like high-speed scanners as an example.
One technology featured, the open-source Spring Rich Client Project,
shares code with the popular Spring application framework for Java
but is geared to rich client applications.  The mission of the
project is to provide an elegant way to build rich client
applications that leverage the Spring framework, he said. The
initial focus is support for Swing applications, according to the
project's Web site. Another open-source project, jMatter, is built
for developing applications for small businesses. It leverages
Naked Objects Architectural Pattern, which presents new ideas on
how to build applications, said Eitan Suez, author of jMatter and
president of Uptodata. Swing and the Hibernate object-relational
persistence software are featured in jMatter. SwiXml is a GUI
generating engine for Swing applications. GUIs are described in
XML documents that are parsed at runtime and then rendered into
javax.swing objects, according to the SwiXml Web site. SwiXml is
used mostly for desktop applications. With SwixML, code is
separated from the layout like with HTML, making for easier
maintenance, said Wolf Paulus, developer of SwixML and a software
architect at Cardiff. Another technology discussed, Canoo
UltraLightClient, leverages Swing and a Web architecture. Application
logic resides on the server rather than the client. A component-
oriented programming model is leveraged. The UI is rendered in
Swing rather than in HTML.

http://www.infoworld.com/article/07/03/09/HNdesktopfriday_1.html

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CSS Text Level 3
Michel Suignard (ed), W3C Technical Report

W3C announced that the CSS Working Group has released a Working Draft
specification for "CSS Text Level 3". Formerly released in June 2005
under the title "CSS3 Text Effects Module," this draft is part of the
Cascading Style Sheets (CSS) language Level 3. CSS level 3 includes
all of level 2 and extends it with new selectors, fancy borders and
backgrounds, vertical text, user interaction, speech and much more.
This CSS3 module "CSS Text Level 3" defines properties for text
manipulation and specifies their processing model. It covers line
breaking, justification and alignment, white space handling, text
decoration, and text transformation. White space processing in CSS
interprets white space characters for rendering: it has no effect on
the underlying document data. In the context of CSS, the document
white space set is defined to be any space characters (Unicode value
U+0020), tab characters (U+0009), or line break characters (defined
by the document format: typically line feed, U+000A). Control
characters besides the white space characters and the bidi formatting
characters (U+202x) are treated as normal characters and rendered
according to the same rules... In many writing systems, words are
always separated by spaces or punctuation. In the absence of a
hyphenation dictionary, a line break can occur only at these explicit
word boundaries. In Chinese and Japanese typography, however, no
spaces nor any other word separating characters are used. In these
systems a line can break anywhere except between certain character
combinations. Additionally the level of strictness in these
restrictions can vary with the typesetting style... Text wrapping is
controlled by the 'text-wrap' and 'word-wrap' properties... When
restricted text-wrapping is enabled, UAs that allow breaks at
punctutation other than spaces should prioritize breakpoints. For
example, if breaks after slashes have a lower priority than spaces,
the sequence "check /etc" will never break between the '/' and the
'e'. The UA may use the width of the containing block, the document
language, and other factors in assigning priorities... the
'word-spacing' property specifies spacing behavior between words:
the first 'word-spacing' value specifies the desired (optimum)
spacing; the second value specifies the desired minimum spacing
limit, and the third specifies the desired maximum spacing limit...

http://www.w3.org/TR/2007/WD-css3-text-20070306/
See also W3C CSS references: http://www.w3.org/Style/CSS/

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DOA with SOA
Alex Bell, ACM Queue

"Many people have different ideas about what SOA is and is not.
Thankfully, I have the benefit of a 13-year-old daughter in the
household, so there is no shortage of expert opinion on any topic. I
asked her what she thought was meant by service-oriented architecture.
She told me that this was an approach used for constructing the
buildings where she buys, among other things, her Hollister and
American Eagle clothing. There are certainly different opinions about
what SOA might be, but this one might be a bit extreme. Some projects
might say they are dancing the SOA tango merely by using XML, WSDL,
SOAP, and UDDI technologies. Others may believe they are saluting the
SOA flagpole if they are using OOD and their classes are stateless.
In actuality, SOA describes an architectural style that is independent
of using a particular technology. This architectural style involves
advertisement of services in some form of a registry that clients can
use to introspect, discover, hook up to, and invoke services of their
choosing. The properties associated with these services are described
by SLAs (service-level agreements), which might be measured in terms
of processing time, number of messages per minute, and number of
rejected transactions. SOA is enabled by technologies such as those
mentioned earlier, as well as others such as CORBA and DCOM, which
have been around much longer... How is your SOA health? Do you presume
that SOA can be enabled only by Web services? Do you believe that the
benefit of properties such as encapsulation and abstraction are
important only in "old-fashioned" architectural approaches? Has
implementing your definition of SOA resulted in elimination of any
major engineering activities? Pay close attention to how you answer.
You will not want to miss the warning signs of potentially being
DOA with SOA.

http://www.acmqueue.org/modules.php?name=Content&pa=showpage&pid=464

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