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The XML syntax itself is derived from Standard Generalized Markup Language (SGML). SGML was adopted as an ISO standard in 1986. XML is a subset of SGML that is intended to be as powerful as SGML but easier to use. XML has gained a lot of popularity as well as hype in the last few years. There are good reasons for this, since some of the work of formatting and syntax can be provided to a system in a standardized way that allows the system to parse out the information in which it is interested. From an industry hype perspective, creating a mobile architecture that uses XML is quite attractive. However, there are some issues to consider. First of all, XML by itself simply allows a way for structuring data. How systems interpret and manipulate the content of an XML structure depends on the underlying system. In order to share information between systems both the producer and consumer of the XML content must agree on a common schema. This schema can be validated using a Document Type Definition (DTD) describing the items that make up a valid document for your particular case. Although some standard XML schemas for various industries are emerging it is unlikely, at this point, that simply choosing XML for data transport is the total solution. At a minimum, you need to build or buy a component capable of formatting data into your XML format and extracting or parsing the data out of the documents. More than likely, you will need to devise your own schema. If you are in a position where you need to define your own schema it may be a good idea to reexamine why you are using XML. After all, if you are defining the schema, the format of your XML will be proprietary. Make certain you understand what XML is buying you. Caveats and tradeoffs of XML There are a number of considerations that need investigating before choosing XML as the solution. In some cases, XML is appropriate, but not always. If you are targeting CLDC-class devices, XML may be difficult to support. Many of the parsers require as much as 45 kilobytes of binary code space on the device. Due to restrictions of the device, a CLDC application may not have the luxury of binary code space or processing power to support an XML parser, not to mention the memory required to perform parsing. Most lightweight XML parsers support the Simple API for XML (SAX) approach for parsing documents as opposed to the Document Object Model (DOM) approach. In many cases, this is the only parsing approach available due to the memory advantages of SAX. The main difference is that with DOM, the entire XML tree is constructed in memory where a SAX parser throws events to an application as the data is parsed, allowing the application to deal with the data immediately. By delegating the data handling immediately, a SAX parser does not need to hold onto the data being parsed. A SAX parser simply provides a means for inspecting and dealing with the data contained in the XML document. What happens to the data is entirely the responsibility of the application or component using the SAX parser.
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If you are targeting CDC devices, deploying an XML parser with your application may not increase the application footprint beyond the limits of the device as CDC devices tend to have, on average, at least 2 MB of space available. These devices tend to have more processing power as well, which is important for running XML parses since, in J2ME terms, parsing can become resource-intensive. XML over networks Regardless of whether CDC or CLDC devices are being used, the network connection rate must be considered as well. XML requires quite a bit of information beyond the data itself, such as the tags, header information, and so forth. While this information may be useful in some applications, it can be considered bloated when compared to a comma-delimited format. This may impact transmission time if the formatting is complex. XML and existing systems There are a number of reasons for choosing XML as a data transport format. For example, if there is an existing system that the device must communicate with that requires an XML interface you may have little choice. Also, there are advantages to reusing the existing XML portal. The architectural tradeoff is between reusing the server interface vs. slimming down the transport format and requiring an XML parser on the device. Home-grown parsing One thing to point out, as another option, is that using XML as a data transportation format does not necessarily require an XML parser to construct and parse XML streams. You may be able to get away with parsing the XML yourself, using the String function indexOf() and grabbing what you are interested in. Data complexity XML also becomes attractive when complex data formats are involved, such as a format with lots of nested data. An example of this might be a customer record that contains a list of orders. An undetermined number of orders will be enclosed within the customer record. Furthermore, each order may contain nested information such as a list of addresses, some of which are optional such as billing address, shipping address, home office address, and so forth. If you do not require a complex format, or a complex format can be divided into smaller, less complex formats, you may want to reconsider the use of XML as a data transport format. However, if validating the data format is critical to the application, XML may be a good choice since XML can validate an XML document against a DTD. Table 11.1 lists a few of the XML parsers available for J2ME devices. More information on these APIs can be found in chapter 15.
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