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Table 11.1
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XML Parser Description NanoXML TinyXML Aelfred kXML Non-validating parser written in Java with a minimum footprint of 6 kilobytes. NanoXML is available at nanoxml.sourceforge.net. Non-validating parser written in Java with a minimum footprint of 16 kilobytes. TinyXML is available at www.gibaradunn.srac.org/tiny/index.shtml. DTD-aware parser supporting event-based parsing. Aelfred is available at www.opentext.com/microstar. Parser with optional WAP Binary encoded XML parsing capabilities (WBXML). Binary encoding allows the XML stream to be made smaller to improve network efficiency over sending the XML as ASCII text. kXML is available at www.kxml.org.
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Example of an XML format The following example shows the use of XML for submitting a product order. Since most lightweight parsers are non-validating, the example is provided without a DTD. Furthermore, for efficiency, the format uses attributes rather than elements to contain the data. Parsers can deal with attributes more efficiently. The drawback of not using elements is that the document cannot be validated against a DTD. Even if the J2ME client does not validate records, there may be reasons you want to perform this step on the server.
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<OrderRecord> <Order id=4444> <Product id=1001 /> <Quantity value=4 /> </Order> <Order id=4445> <Product id=3003 /> <Quantity value=2 /> </Order> <Order id=4446> <Product id=4004 /> <Quantity value=8 /> </Order> </OrderRecord>
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Delimited formats If XML is not a viable solution due to the API footprint, network bandwidth or processing power issues, a delimited stream format may be an option. A simple delimited markup can be devised using one or two well-chosen delimiters. By well-chosen, we mean that you must be careful to pick a delimiter that will not interfere with the protocol over which the data is being sent. Additionally, the delimiter must be uniquely distinguishable within the data stream. Using a comma or semi-colon as a delimiter may not work if these characters appear in the data itself as punctuation marks. Using delimiters allows the data format to be rather compact, since the length of the data elements does not need to be defined in order to create or parse the streams. GUIDELINES FOR BUILDING J2ME APPLICATIONS 309
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The downside to using a delimited format is that the sender and receiving systems must both understand what data is in what positions, or a header must be sent to provide this information. If you are in control of both sender and receiver, it may be possible to reuse the code that packages the data and unpackages the data for transmission on both the client and the server. Without enclosing the format in the header, the format must be hard-coded into the classes themselves. If header data is included as part of the format, you may want to revisit using XML since this is what XML excels at providing. However, even with a header involved, this format can still be slimmer than XML-formatted data. The following is an example of delimited syntax. This particular format uses semi-colons as the primary delimiter and commas as a nested delimiter. Header:
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OrderNumber, ProductNumber, Quantity
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Data Example:
4444,1001,4;4445,3003,2;4446,4004,8
In the preceding example each record contains three data elements. A semi-colon separates each record. Name-value formats A common method for sending data over the Internet is the use of name=value pairs. Most browsers and web applications utilize this format. The benefit is that the format is rather agile and can be used to send arbitrary sets of data. For example, if a data element is empty or does not apply in some cases, it can be omitted from the stream. In comparison, null values in delimited or XML formatted data must be represented by a null marker or an empty value. This is one of the simplest solutions and may not require a lot of thought. However, there are some implications if the data sets are large or the data format is complex. If the data sets are large, the field information (the name) must be repeated for each record. In the delimited scenario, the field information can be specified once, in the header or in the software itself. If the transmission is sending multiple records in a name=value format there may be quite a bit of redundant data being sent over the connection unnecessarily. The following examples show data formats for name=value pair streams. In this case, in order to identify data elements as a record, the order of elements is meaningful or the OrderNumber must be included as part of the name. In the first example, the parser assumes that all data following an OrderNumber belongs to that order.
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