an introduction to processing xml with rpg

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Intro to processing XML with RPG and SQLpptx

What We’ll Cover XML – A First Look A Review of Parsers XML-INTO: A Closer Look XML-SAX: A Closer Look XML and SQL Wrap-up Essential Definitions ESSENTIAL DEFINITIONS What is XML and why use it? Parsers – Two types! Well formed document Where is XML typically stored on the IBM i? What We’ll Cover Essential Definitions A Review of Parsers

Why do XML elements have a namespace?
Sometimes elements are prefix with a namespace, a name given to them to ensure uniqueness. Name is such a generic word it could apply to a person or a thing, and both could be in the same XML file. Here I have added a namespace, Test, to the elements of my XML file.
Does RPG support XML?
That said, let’s get started. The heart of RPG’s XML support is XML-INTO. On the surface it is a deceptively simple op-code, using only two factors. The first identifies the target for the extracted data and the second information about the XML source.
Which XML-into operation is needed to process a XML document?
If we assume that the XML document is contained within the IFS file Customers.xml in directory XMLDocs, then the XML-INTO operation needed to process the document would be: Where the character variable fileLocn contains the value /XMLDocs/Customers.xml.

Handling Namespaces

I haven’t got time to go into all the whys and wherefores of namespaces. For now let’s just say that they allow you avoid name collisions by qualifying element and attribute names. In this respect they are similar to adding the QUALIFIED keyword to an RPG DS in that you can now have multiple fields with the same name and use the DS name to qualify

Handling Element Names containing “Illegal” Characters

There is one more processing option that we haven’t discussed that you will find you need quite often. Just as the colon is not valid in an RPG name, nor are a number of other characters that are valid in XML names. In North America, and most English speaking countries, the most common one that you will encounter is the hyphen. While names includin

Wrapping Up . . .

There are a few other XML-INTO options that you may have need of from time to time, but hopefully I have covered all of the ones you are likely to need in your daily work. So that you can “play” with the code I have also included the XML used in the examples. You can download the zip file here. Jon Paris is one of the world’s foremost experts on pr

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