Generic XML parser class: Arbitrary XML parser.

- Parses arbitrary XML input and builds an array with the structure of all tag and data elements.
- It can validate and extract data from a whole XML document with just a single call. It supports validationg common tag value data types and can perform custom validations using a subclass.
- Optionally, keeps track of the positions of each element to allow the determination of the exact location of elements that may be contextually in error.
- Supports parsed file cache to minimize the overhead of parsing the same file repeatdly.
- Optimized parsing of simplified XML (SML) formats ignoring the tag attributes.
- Validate and extract data from a whole XML document with single function call

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