High memory usage with Saxon/C + PHP
I'm using a large XSL file (see attached, generated from Schematron rules) to process an XML file, and finding that the PHP extension is using 10x the amount of memory that Saxon uses to process the same file in Java.
When running the conversion with regular Saxon-HE on the command line, the memory usage of the Java process reaches 400MB and the processing takes ~20s.
When running the same conversion via Saxon-C as a PHP extension (using the patched catalog-aware files from https://saxonica.plan.io/issues/4274), the memory usage of the Apache instance reaches 4GB and the processing takes ~40s.
While there are obviously optimisations that can be made to the generated XSL to improve processing times, is it expected that the memory usage would be so much higher in the PHP extension?
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