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One of the great challenges that hinders the global adoption of XML by the corporate community is the potential fragmentation and splintering of XML standards Corporations are concerned about three standards First, corporations are concerned that companies, such as Microsoft, will not adhere to the W3C recommendations and specifications This concern is probably not valid because all of Microsoft s actions to this moment have implied full support of emerging XML standards The only deviation is when the standard is not yet well defined, so Microsoft produces software that is based on an interim standard Then when the true standard is finalized, Microsoft reissues its software For the most part, these software applications are free, with no major financial impact Second, corporations are concerned with the variety of possible XML vocabularies and dialects that a department, corporation, or industry may produce One of the major goals for XML is interoperability; however, its main strength, extensibility, results in a conflict On the one hand, interop-

The ANSI-41 network reference model is a logical model depicting logical functional entities and interfaces that may comprise a wireless telecommunications network But how does this logic relate to real implementations of networks How is the model representative of the many network implementation variations that can and do exist Wireless telecommunications network standards enable any wireless service provider, large or small, conveniently and efficiently to offer a standard set of wireless telecommunications services to subscribers From a technical perspective, differences in the number, quality, and options of the standard services, as well as the deployment of additional

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nonstandard services, are what differentiate one service provider from another The ANSI-41 standard is designed to allow many diverse implementations; it has been developed, and continues to be enhanced, with these implementation considerations in mind A wide variety of differing ANSI-41 network implementations exists today and all can claim compliance to the ANSI-41 standard While the model is logical and intangible, the actual network is physical and very tangible An individual ANSI-41 network is usually comprised of many MSCs, each deployed as a separate physical switching platform The number of MSCs supported within a single wireless service provider network is a function of the traffic capacity and geographic service area supported Although the ANSI-41 standard allows multiple MSCs to be served by a single distinct VLR, there is usually a one-to-one relationship between MSCs and VLRs Each MSC usually employs the VLR functionality internally; that is, the VLR is not normally deployed as a physically separate computing platform distinct from the MSC This is due to the very close relationship between the MSC and VLR functions as defined by ANSI-41 HLRs are deployed as both separate network platforms and internal to MSC platforms An HLR usually provides service to many MSCs in a single network If an HLR is deployed internal to an MSC, other MSCs in the network communicate with that MSC as if it were a standalone HLR A network can support multiple distinct HLR platforms, serving specified geographic areas, or based upon some other division of subscribers The HLR, though, is still considered to be a single logical entity in a given wireless service provider network; ie, a single subscriber profile record cannot exist in more than one active HLR The term active refers to the concept of physical network node replication HLRs may be deployed as an active/standby replicated pair, since a failure will interrupt service to subscribers (see Figure 49) Many functional entities can be deployed as redundant systems Redundancy, in the form of node replication, allows for very high service availability Replicated platforms are usually separated geographically This avoids service interruptions based on catastrophic failure at a given site The most common catastrophic examples used by engineers are hurricanes, earthquakes, and fires There are two configurations for deploying replicated network nodes: load-sharing pair and active/standby pair A load-sharing pair requires both of the replicated platforms to be active and serve the network equally, with no distinction as to which platform sends, receives, or processes information In case of failure of one of the platforms, the other can handle all the network traffic An.