[NEW] AElfred: a small, fast XML Parser
Microstar Software Ltd. is happy to announce Ælfred (AElfred), a small, fast, DTD-aware Java-based XML parser, especially suitable for use in Java applets. We've designed Ælfred for Java programmers who want to add XML support to their applets and applications without doubling their size: Ælfred consists of only two class files, with a total size of approximately 24K, and requires very little memory to run. Ælfred also implements Java's java.lang.Runnable interface and a zero-argument constructor, so it's easy to start Ælfred as a separate thread or to adapt it for use as a JavaBean. Ælfred is free for both commercial and non-commercial use, and COMES WITH NO WARRANTEE. You can download a copy of version 1.0 (with source code) from the following URL: http://www.microstar.com/XML/index.htm There is also an applet to let you try Ælfred online in your own browser before download it. ***************** DESIGN PRINCIPLES ***************** 1. Ælfred must be as small as possible, so that it doesn't add too much to your applet's download time. STATUS: Ælfred is currently about 24K in total, and we're still looking for ways to shrink it further. 2. Ælfred must use as few class files as possible, to minimize the number of HTTP connections necessary for applets. STATUS: Ælfred consists of only two class files, the main parser class (XmlParser.class) and a small interface for your own program to implement (XmlProcessor.class). All other classes in the distribution are just demonstrations. 3. Ælfred must be compatible with most or all Java implementations and platforms. STATUS: Ælfred uses only JDK 1.0.2 features, and we have tested it successfully with the following Java implementations: JDK 1.1.1 (Linux), jview (Windows NT), Netscape 4 (Linux and Windows NT), Internet Explorer 3 (Windows NT), and Internet Explorer 4 (Windows NT). 4. Ælfred must use as little memory as possible, so that it does not take away resources from the rest of your program. STATUS: On a P75 Linux system, using JDK 1.1.1, running Ælfred (with a 4MB XML document) takes only 2MB more memory than running a simple "Hello world" Java application. Because Ælfred does not build an in-memory parse tree, you can run it on very large input files using little or no extra memory. 5. Ælfred must run as fast as possible, so that it does not slow down the rest of your program. STATUS: On a P75 Linux system, using JDK 1.1.1 (without a JIT compiler), Ælfred parses XML test files at about 50K/second. On a P166 NT workstation, using jview, Ælfred parses XML test files at about 1MB/second. 6. Ælfred must produce correct output for well-formed and valid documents, but need not reject every document that is not valid or not well-formed. STATUS: Ælfred is DTD-aware, and handles all current XML features, including CDATA and INCLUDE/IGNORE marked sections, internal and external entities, proper whitespace treatment in element content, and default attribute values. It will sometimes accept input that is technically incorrect, however, without reporting an error (see README), since full error reporting would make the parser much larger. 7. Ælfred must provide full internationalisation from the first release. STATUS: Ælfred supports Unicode to the fullest extent possible in Java. It correctly handles XML documents encoded using UTF-8, UTF-16, ISO-10646-UCS-2, ISO-10646-UCS-4 (as far as surrogates allow), and ISO-8859-1 (ISO Latin 1/Windows). With these character sets, Ælfred can handle all of the world's major (and most of its minor) languages. *********************** ABOUT THE NAME "Ælfred" *********************** Ælfred the Great (AElfred in ASCII) was king of Wessex, and at least nominally of all England, at the time of his death in 899AD. Ælfred introduced a wide-spread literacy program in the hope that his people would learn to read English, at least, if Latin was too difficult for them. This Ælfred hopes to bring another sort of literacy to Java, using XML, at least, if full SGML is too difficult. The initial "Æ" (AE ligature) is also a reminder that XML is not limited to ASCII. Enjoy! David --- David Megginson ak117@f... Microstar Software Ltd. dmeggins@m... http://home.sprynet.com/sprynet/dmeggins/ xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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