Applying Transformations
The XSL style sheet and the XML source can be loaded from a variety of sources, including local disk files and remote URLs. You can’t load style sheets and source documents from a stream, but because you can easily obtain an XML reader from a stream, a workaround is quickly found. Whatever the input format, the content is transformed into an XPath navigator object immediately after reading.
In light of this, passing style sheet and XML source data directly as XPath documents or navigators is advantageous from two standpoints: you save conversion time, and you work with objects whose internal storage mechanism is lighter and more compact.
Choosing optimized forms of storage like XPath documents binds you to a read-only ...
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