Summary
Comments are an integral part of programming in all languages and at all levels. Inserting a comment into a file that's being generated is an important operation, so that was the point of the first part of this hour.
Database queries return a subset of the data file's contents, and XSL queries are no exception. The selection operators allow for the selective extraction of all nodes with specific names at various levels. With the capability to recursively extract all nodes at all sublevels of the hierarchical tree, these operators significantly reduce the amount of programming that's necessary.
The Boolean operators allow for data to be selected based on whether they satisfy one or more criteria. That way the selections can be made more ...
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