|By Ram Kumar||
|October 24, 2002 12:00 AM EDT||
The greatest benefit of XML lies in its potential for managing "islands of data" locked into proprietary tools, systems, applications, and technologies through the use of a common data format that's understandable to any process and system that use it for data representation, data exchange, and application integration. In fact, if XML doesn't achieve this potential, there is little point in using it at all.
Following a trend all too familiar to the IT industry, XML is being seen as a silver bullet that will magically solve all the problems of data integrity, instantly remove islands of data, and disentangle the spaghetti of data interfaces across the enterprise. Typically, those who have willingly embraced this "Next Big Thing" approach will be sadly disappointed, and another real opportunity to move forward could be lost.
XML's greatest strength is also its biggest weakness. It is so flexible that different vocabularies and structures can be written to define the same type of data. Left unchecked, this can lead to a confused set of fragmented, point-to-point XML formats that simply move the problems of data islands and integration around, instead of actually addressing them. Evidence from early (and very expensive) XML implementations confirms this problem. Many software vendors are implementing proprietary layers of XML that can give the appearance of providing a common format for data exchange, but in fact are designed to lock users into proprietary platforms. As a result, eXtensible Markup Language is fast becoming the "eXtensively Misused Language."
XML will only succeed when businesses truly embrace the principles of openness, transparency, and reusability that XML can support. This will require moving away from point-to-point negotiations for exchanging data toward an agreement on standard ways of defining and expressing XML vocabularies, and on common guidelines for the implementation and ongoing use of these standards.
The Need for an XML Clearinghouse
The effective application of XML to overcome the "islands of data" problem requires proper implementation strategies to ensure consistent exchange and reuse of information assets using XML. All projects using XML should have uniform access to appropriate XML documents and their related metadata, which can be only be achieved through the development and deployment of an XML Clearinghouse (also known as XML registry and repository) for the enterprise that provides a single location to store and manage the common XML standards and vocabularies used in the enterprise.
An enterprise XML Clearinghouse allows users to:
1. Discover and use pertinent XML components in the enterprise
2. Register additional XML components that can be reused (e.g., projects, applications) by other projects within the enterprise
What is an XML Clearinghouse?
An XML Clearinghouse is a software model that consists of two key components:
1. Registry: Stores relevant descriptive information, or metadata, about registered information components and their associated objects, and allows the metadata to be operated on in various ways.
2. Repository: Stores the registered information components and their associates. It also provides interfaces to retrieve and use registered information components and associated objects.
Registered information components and their associated objects provide users with the information necessary to effectively use them. The key information components registered in the Clearinghouse are the XML Schemas and XML DTDs that can be reused within the enterprise by XML developers, projects, applications, etc. Other information components may also be registered.
Examples of associated objects of registered information components include:
- XML documents
- XML specifications
- XML specifications usage
- UML models
- Other projects that use the information components and the implementation details
- XML design and implementation guidelines
- Usage conflicts and collisions, including details of their resolution
- Business process descriptions
- Trading partner agreements
The XML Clearinghouse can store different XML-specific files: XML, XSL, XSLT, XSD, and many others from the XML family. The main goal of the registry and repository is to share XML vocabularies between interested parties so they can discover and understand each other's vocabulary. The XML Clearinghouse ensures consistency, quality, and compatibility among XML projects within the enterprise and also helps to ensure that the XML standards used are controlled and monitored effectively.
Using the XML Clearinghouse
The following step by step example illustrates how the XML Clearinghouse works:
Note that the registry should also provide facilities to store multiple versions of the same XML vocabulary. However, it is up to each project to decide which versions of the XML vocabulary it will support.
Figure 2 shows how an XML developer can hypothetically use an XML Clearinghouse in a government environment consisting of many agencies and business units.
Benefits of an XML Clearinghouse
The XML Clearinghouse is an essential part of the infrastructure that supports the reuse of common information components across business applications. It has four main benefits:
1. Helps protect enterprise information assets: The information assets represented in the form of XML Schemas and DTDs that are commonly and consistently used across the enterprise are preserved, maintained, and protected from being locked into proprietary or custom-built applications that result in new data islands.
2. Promotes cross-project activities: The XML Clearinghouse stores information on the use of the XML Schemas and DTDs by different projects, which gives projects insight into XML-related activities and provides opportunities for collaboration.
3. Promotes a common understanding of information components: Storing the information models and metadata for subject areas (such as customer, product, etc.) as XML Schema in a single location promotes a common understanding of the purpose of the registered information components.
4. Facilitates B2B communication: External business partners can access the XML Clearinghouse so they can exchange data with the enterprise in the same standard ways used by internal business systems. This can expedite B2B communication and greatly reduces the cost of supporting it.
The main thrust of the XML Standards Clearinghouse work is to provide visibility and awareness of XML data elements in use within various functional areas across an enterprise. This awareness is important to application integrators and system interfaces.
Use of an XML Clearinghouse needs governance
Despite the benefits of having an XML Clearinghouse for an enterprise, if the XML Clearinghouse were left uncontrolled, every point-to-point XML vocabulary would be registered, each reflecting the narrow interests of application areas. This would result in the proliferation of many diverse data formats within an enterprise to represent the same piece of data. New data islands of information would be created, resulting in new and expensive one-off formatting problems. This would seriously threaten the credibility and integrity of the XML Clearinghouse and defeat the purpose of using XML in the first place.
An XML Clearinghouse will only be effective if policies are set, usage guidelines established, and a management and funding process put in place for effective operation. Policies and procedures should include:
Benefits of a governance model
The benefits of a governance model to manage XML Clearinghouse use in an enterprise are numerous. Some of the key benefits are listed below:
Potential XML-Related Work in an Enterprise and the Importance of Governance
This section describes the different types of XML-related work experienced implementing XML strategies for enterprises and the importance of governance for such projects.
Projects that use existing XML standards
Projects could be using existing industry XML standards. It's therefore important for the enterprise to monitor and govern this type of project for the following reasons:
Projects that need to extend or develop XML standards
There will be situations where existing industry XML standards don't meet the requirements of a project. In such circumstances the project may decide to cover identified gaps by extending existing standards, or by developing a new standard. It's important for an enterprise to monitor and govern this activity in order to:
Developing enterprise XML standards
Projects in an enterprise may be building an enterprise XML standard for a subject area not addressed by existing standards, and the enterprise must govern this type of activity. It's important to:
Turn locally developed XML into open industry standards
There may be times when an enterprise decides to submit an XML standard it has developed to a global XML standards body or a local (e.g., national) standards body to ratify it as an "open" XML standard. For example, our organization submitted three XML standards for customer information management to OASIS to develop and promote them as open industry standards free of royalty and IP issues:
- NAML: Name and Address Markup Language
- CIML: Customer Identity Markup Language
- CRML: Customer Relationships Markup Language
- xNL: Extensible Name Language
- xAL: Extensible Address Language
- xNAL: Extensible Name and Address Language
- xCIL: Extensible Customer Information Language
- xCRL: Extensible Customer Relationships Language
The XML Standards Governance model will enable enterprises to form closer relationships with global/local standards bodies and provides the opportunity to establish business relationships with other organizations involved in the standards initiative and those who are using the standards.
XML allows the specification of an arbitrary set of nonbinary tags for representing information components. This offers an open, independent, and low-cost platform for representing information for a multitude of purposes. However, left uncontrolled, the introduction of XML results in the proliferation of many diverse data formats that represent the same piece of information. This would create new islands of information and result in a new version of the expensive one-off formatting problems that most enterprises are looking to solve.
Information components can be shared, exchanged, and reused through the deployment of an XML Clearinghouse for the enterprise that provides a single, common, sharable location to store and manage the XML standards and vocabularies used in the enterprise. However, the technical solutions used to implement an effective XML strategy need to be managed properly. It is therefore important for an enterprise to establish an XML Standards Governance Model for the XML Clearinghouse to oversee the effective development and deployment of an integrated set of XML standards to represent, share, and exchange enterprise information components.
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