TweetFollow Us on Twitter

May 00 Online

Volume Number: 16 (2000)
Issue Number: 5
Column Tag: MacTech Online

May 00 Online

By Jeff Clites <online@mactech.com>

A few months ago, we briefly touched on the subject of XML, the biggest hype magnet since Java. A quick glance at any IT-related publication or website will give you a pretty good idea of the degree of interest there is in anything related to XML, and companies are churning out press releases about their plans to utilize XML faster than the press can cover them. XML isn't the Next Big Thing, it's the Current Big Thing. No matter where you stand on the hype-versus-substance issue, as a developer you'll need a working understanding of the technology to meet the demands of new standards and new modes of application interoperability. Beneath the static there is great potential in XML, and everyone will benefit from the attention it is drawing to issues surrounding communication and standardization. This month we'll cover a few of the resources you can turn to when working with this rapidly growing technology.

Documentation

Although there are many choices available, it is difficult to find the perfect printed reference; many of the obvious choices turn out not to be very good, and the field is evolving so rapidly that even the high-quality books quickly become out-of-date. For the moment, though, there are a couple of winners. The XML Pocket Reference, from O'Reilly and Associates, serves as both a beginner's introduction and a quick reference. For an extensive survey of current (and developing) technologies and APIs, try Professional XML from Wrox Press.

XML Pocket Reference
<http://www.oreilly.com/catalog/xmlpr/>

Professional XML
<http://www.wrox.com/Consumer/Store/Details.asp?ISBN=1861003110>

There is also no end to web-based coverage. An indispensable source is the XML FAQ, which covers a wide range of topics, and is well written. At the other end of the difficulty spectrum is the XML specification itself. Although you'll want to avoid it as long as possible, at some point you'll need to go back to the source to get the definitive word on something. It's a difficult read, but there is a cleverly-constructed annotated version available, which makes deciphering the formal language a bit easier. This latter reference is provided by XML.com, which is an excellent source of references and ongoing coverage of the industry, with timely articles on emerging technologies. Next, the XML Cover Pages are an exhaustive and neutral reference for all things XML (and SGML) related. Also of general interest is the original "mission statement" of the XML standard, which sets forth the design goals for its development. Finally, those planning on developing or working with XML parsers should take a look at the Lark parser, developed by Tim Bray, co-editor of the XML specification. It does not appear to be under active development, but it does provide an interesting case study in parser development in Java.

The XML FAQ
<http://www.ucc.ie/xml/>

The Annotated XML Specification
<http://www.xml.com/pub/axml/axmlintro.html>

XML.com
<http://www.xml.com/pub>

The XML Cover Pages
<http://www.oasis-open.org/cover/xml.html>

Design Principles for XML
<http://www.textuality.com/sgml-erb/dd-1996-0001.html>

An Introduction to XML Processing with Lark and Larval
<http://www.textuality.com/Lark/>

Programming XML

XML was designed to be easy to parse, and XML documents are often characterized as self-describing, but if you need to develop an XML-processing application you'll quickly find out that this is nonetheless not a trivial job. Fortunately, there are a number of parsers out there to help you with this task, and simple XML documents can in fact be created and parsed simply. One of the first XML parsers, and perhaps the most widely used, is James Clark's expat. It's a non-validating parser written in C, and recently an Objective C wrapper has been created for it, so it should be straightforward to use it from within Cocoa applications. (I believe that expat is also being used internally within Mac OS X, but it isn't clear what sort of API Apple will provide to access it.) Moving forward, it is likely that the Xerces parsers, which are part of the Apache XML project, will be widely used. They are validating parsers, and are available in Java, C++, and Perl. Much of their code originated from IBM's alphaWorks project, and IBM continues to provide its own versions, XML4J and XML4C for the Java and C++ versions respectively, which combine Xerces with their own Unicode classes, providing support for an expanded range of encodings. Apple is in fact using XML4J in their recently-released version 4.5 of WebObjects, and again it isn't clear to what extent the parser will be accessible from other parts of Apple's frameworks. Xerces-C contains a fair amount of code which must be customized when porting it to new platforms, but a classic Mac OS port has been developed, and a BSD version is in development which is likely to compile under Mac OS X. Also of note is the gnome-xml parser, which is under active development. It falls under the umbrella of the Linux Gnome project, but it is independent of the rest of Gnome and should be portable to other environments and platforms. (For example, it is known to work under Windows.) It is also a validating parser, but appears to be simpler than Xerces and may be worth a look if you need to access a validating parser from C and related languages. The gnome-xml web page also has links to several other articles to get you started, and in particular you should take a look at the article on IBM's developerWorks site.

expat - XML Parser Toolkit
<http://www.jclark.com/xml/expat.html>

Objective C wrapper for the expat XML Parser
<http://softrak.stepwise.com/Apps/WebObjects/Softrak.woa/1/wa/displayPackage?package=815&os=10>

The Apache XML Project
<http://xml.apache.org/>

IBM's XML Parser for Java (XML4J)
<http://www.alphaworks.ibm.com/tech/xml4j>

IBM's XML for C++ parser (XML4C)
<http://www.alphaworks.ibm.com/tech/xml4c>

The XML library for Gnome
<http://xmlsoft.org/>

Making application programming easy with GNOME libraries, Part 3
<http://www-4.ibm.com/software/developer/library/gnome3/>

If you're experimenting with XML for the first time, or you need to process XML in a web-related context, you should check out the numerous Perl modules available. A good place to start is the libxml-perl package. Of particular interest are the XML-Grove modules, which let you manipulate an XML document as a tree of objects and access various parts of it using a path-like syntax. This is analogous to the DOM and XPath APIs, and the grove interface will likely become obsolete after these have matured, but in the short term it provides a convenient and powerful approach to XML processing. There are a number of other APIs available for working with XML documents from Perl, including DOM-based and SAX-based parser APIs (the former allows you to access XML documents as a tree of objects, and the latter as a stream of events), as well as support for various approaches to XML querying. IBM has two excellent articles which are not to be missed; one gives a brief run-through of all of the XML-related Perl tools available, and the other gives a detailed tutorial on manipulating XML using Perl, including conversion of XML to HTML and XML-driven database access.

libxml-perl
<http://bitsko.slc.ut.us/>

Essential tools and libraries for using XML with Perl
<http://www-4.ibm.com/software/developer/library/perl-xml-toolkit/>

Manipulating XML documents with Perl and other scripting languages
<http://www-4.ibm.com/software/developer/library/xml-perl/>

When you grow weary of mucking around with the innards of the future web, cruise on over to the MacTech Online web pages at <www.mactech.com/online/>, and let you browser worry about the parsing for a while.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

FileMaker Pro 19.4.2 - Quickly build cus...
FileMaker Pro is the tool you use to create a custom app. You also use FileMaker Pro to access your app on a computer. Start by importing data from a spreadsheet or using a built-in Starter app to... Read more
Adobe Illustrator 26.0.3 - Professional...
You can download Adobe Illustrator for Mac as a part of Creative Cloud for only $20.99/month. Adobe Illustrator for Mac is the vector graphics classics in the design industry. It is a digital... Read more
WhatRoute 2.4.9 - Geographically trace o...
WhatRoute is designed to find the names of all the routers an IP packet passes through on its way from your Mac to a destination host. It also measures the round-trip time from your Mac to the router... Read more
Notion 2.0.20 - A unified workspace for...
Notion is the unified workspace for modern teams. Notion Features: Integration with Slack Documents Wikis Tasks Release notes were unavailable when this listing was updated. Download Now]]> Read more
Monterey Cache Cleaner 17.0.2 - Clear ca...
Monterey Cache Cleaner is an award-winning general-purpose tool for macOS X. MCC makes system maintenance simple with an easy point-and-click interface to many macOS X functions. Novice and expert... Read more
Firetask Pro 4.6.8 - Innovative task man...
Firetask Pro represents the next generation of easy-to-use, project-oriented task management apps. By combining David Allen's powerful Getting Things Done (GTD®) approach with classical task... Read more
Smultron 13.0.4 - Easy-to-use, powerful...
Smultron 13 is the text editor for all of us. Smultron is powerful and confident without being complicated. Its elegance and simplicity helps everyone being creative and to write and edit all sorts... Read more
Box Sync 4.0.8057 - Online synchronizati...
Box Sync gives you a hard-drive in the Cloud for online storage. Note: You must first sign up to use Box. What if the files you need are on your laptop -- but you're on the road with your iPhone? No... Read more
Audio Hijack 3.8.10 - Record and enhance...
Audio Hijack (was Audio Hijack Pro) drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio... Read more
Direct Mail 6.0.1 - Create and send grea...
Direct Mail is an easy-to-use, fully-featured email marketing app purpose-built for macOS. Create, send, and track great looking email campaigns that get results. Start your newsletter by selecting... Read more

Latest Forum Discussions

See All

Hopefully Not Jared’s Last Show – The To...
My suspicions from last week were correct, and after my two kids tested positive for Covid last week both my wife and I have now tested positive as well. It seems you just can’t escape this stuff lately. Thankfully the two little ones are pretty... | Read more »
TouchArcade Game of the Week: ‘Micro RPG...
I feel like idle games are one of those perfect fits for the mobile platform. Not that they replace more involved gaming experiences when you’re in the mood for that, but they do fit in alongside other types of games just fine as a “go to" when you... | Read more »
‘Phantom Blade: Executioners’ Closed Bet...
Phantom Blade: Executioners is holding a small-scale technical test that lets players get first dibs on the KungFuPunk action RPG. Offered to selected players only, S-Game’s first Closed Beta Test will provide players with limited edition in-game... | Read more »
New ‘Warhammer 40,000: Tacticus’ Video S...
Back in September Snowprint Studios, who you may know from their previous Legend of Solgard or Rivengard, announced that they’d partnered up with Games Workshop to put out a new tactical game in the Warhammer 40,000 universe titled Warhammer 40,000... | Read more »
SwitchArcade Round-Up: ‘Pokemon Legends:...
Hello gentle readers, and welcome to the SwitchArcade Round-Up for January 28th, 2022. We’ve got a bunch of new releases to look at today, with a few big hitters, a few mid-level diversions, and a healthy supply of compost. Since it’s Friday, we... | Read more »
Phantom Blade: Executioners, S-Game...
S-Game has kicked off its first Closed Beta Test for Phantom Blade: Executioners, inviting a selected few to get first dibs on the upcoming KungFuPunk action RPG on mobile. The CBT officially begins this January 28th, and beta testers will receive... | Read more »
‘Infinite Galaxy’ First Anniversary: Cel...
Cultivating a new generation of valiant commanders across 240 countries worldwide, Infinite Galaxy has quenched players’ thirst to explore the vastness of space – and there are only more intergalactic adventures to embark on from here on out. Camel... | Read more »
War and Order: How to brave the cold in...
War and Order's 6th-anniversary celebrations are underway, and all in good time too - this season not only brings about fabulous festivities, but it also lets players experience the harsh winter in an entirely new way. [Read more] | Read more »
‘Hidden Folks+’ Is This Week’s New Apple...
The original Hidden Folks from Adriaan de Jongh is an excellent hidden objects game featuring hand drawn visuals. It is an absolute joy to play, and it has now released on Apple Arcade in the form of Hidden Folks+ () as an App Store great. If you’... | Read more »
Mini Metro’s First Big Update of 2022 Ad...
Last year saw great updates for Dinosaur Polo Club’s Mini Metro ($3.99) which is also available on Apple Arcade as an App Store Great. | Read more »

Price Scanner via MacPrices.net

Apple has clearance 2020 13″ MacBook Airs ava...
Apple has clearance, Certified Refurbished, 2020 13″ Intel-based MacBook Airs in stock today starting at only $719 and up to $370 off original MSRP. Each MacBook features a new outer case, comes with... Read more
The cheapest iPhones for sale today at Apple...
Apple has restocked Apple Certified Refurbished iPhone 8 models starting at only $359. Each refurbished iPhone comes with a fresh external case, standard Apple 1-year warranty, and free shipping.... Read more
14″ MacBook Pro with Apple M1 Max CPU now in...
Looking for a new 14″ MacBook Pro with an Apple M1 Max CPU? Stock is finally trickling into Apple resellers. B&H has Silver 14″ M1 Max MacBook Pros in stock today for $2899 including free 1-2 day... Read more
14″ MacBook Pros with Apple M1 Pro CPUs are i...
Amazon is reporting stock of 14″ MacBook Pros with M1 Pro CPUs today with a $50 discount. Shipping is free, and delivery is available by February 1st for most configurations. Be sure to make your... Read more
Apple has restocked 13″ M1 MacBook Pros for $...
Apple has restocked a full line of 13″ M1 MacBook Pros available Certified Refurbished, starting at only $1099 and up to $230 off original MSRP. These are the cheapest M1 MacBook Pros for sale today... Read more
Apple’s AirPods Max headphones are on sale fo...
Amazon has Silver, Blue, and Space Gray Apple AirPods Max headphones on sale today for $100 off MSRP. Shipping is free, and all models are in stock today. Their price is the lowest currently... Read more
Open a new line of service at Verizon and get...
Verizon is giving away 64GB Apple iPhone 12 minis or your choice of an iPhone 11 to customers who choose one of these phones and open a new line of service. Offer is available online only, and no... Read more
Open-box 13″ M1 MacBook Airs now available st...
QuickShip Electronics has open-box return 13″ M1 MacBook Airs in stock and on sale for $200-$400 off MSRP on their eBay store right now with free express delivery. According to QuickShip, “The item... Read more
Verizon’s 2022 iPad promo: $100-$310 off any...
Verizon has cellular-capable iPads on sale for $100-$310 off MSRP when purchased with an Unlimited service plan. Sale price is applied to your account monthly over a 24 or 30 month period, depending... Read more
Sunday Sale: Apple AirPods are on sale for up...
Amazon has Apple AirPods on sale for $10-$100 off MSRP today, depending on the model. All are in stock today with free delivery: – AirPods Max headphones (Blue): $449 $100 off MSRP – AirPods Max... Read more

Jobs Board

Registered Nurse (RN) Employee Health PSJH -...
…is calling for a Registered Nurse (RN) Employee Health PSJH to our location in Apple Valley, CA.** We are seeking a Registered Nurse (RN) Employee Health PSJH to be Read more
Systems Administrator - Pearson (United State...
…and troubleshoot Windows operating systems (workstation and server), laptop computers, Apple iPads, Chromebooks and printers** + **Administer and troubleshoot all Read more
IT Assistant Level 1- IT Desktop Support Anal...
…providing tier-1 or better IT help desk support in a large Windows and Apple environment * Experience using IT Service Desk Management Software * Knowledge of IT Read more
Human Resources Business Partner PSJH - Provi...
…**is calling a** **Human Resources Business Partner, PSJH** **to our location in Apple Valley, CA.** **Applicants that meet qualifications will receive a text with Read more
Manager Community Health Investment Programs...
…is calling a Manager Community Health Investment Programs PSJH to our location in Apple Valley, CA.** **Qualified candidates will be invited to do a self-paced video Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.