Folks,
In the past week or so, I have been soaking up a lot on XML and DOM parsing and
the like. The problem is a familiar one: Given an XML instance doc, parse it,
while validating it against a schema, and get the stuff into a C/C++ struct.
Simple enough? Maybe not quite. Here's what I want to do:
1. Put all the rules in the schema, including type info. I figure, why not use
the power of tools to validate incoming data. Things like integer ranges,
string lengths etc.
2. Use the XercesDOMParser to walk thru all nodes, and dump the values into my
c-struct. I imagine I would define some sort of a handler to the
XercesDOMParser, which would be called as it traverses nodes, making data and
other info (type, attrs etc) available to me. Which handler would that be?
3. If the parser is using the schema, how will the handler make the data
available to me, if it passed validation. For eg. if I have 2 nodes, an
xs:integer and another one xs:string in the schema, then can I just say
something like this?
if ( strcmp(node.getName(), "quantity") == 0) {
int qty = (int)node.getData() ;
} else if ( strcmp(node.getName(), "name") == 0) {
char* name = node.getData() ;
}
Given the bewildering number of ways you can do this, is this the best
approach? Let me say it outright. Is there a primer available?
Thanks!
Vijay
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