[Bug 213478] procstat --libxo produces non-compliant JSON and XML output

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213478

            Bug ID: 213478
           Summary: procstat --libxo produces non-compliant JSON and XML
                    output
           Product: Base System
           Version: 10.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: freebsd-standards at FreeBSD.org
          Reporter: dpslavov at hotmail.com

Just tried the new functionality for machine readable output of "procstat" and
found two issues with non standard compliant output generated for JSON and XML
formats. Suppose that this is an issue with "libxo" library, not "procstat" but
didn't dig further.
For JSON output hexadecimal numbers are printed as normal numbers while JSON
standard says that numbers can be only decimal digits, in my opinion they needs
to be printed as strings. Here is example output showing the issue:

# procstat --libxo:PJ -v 841
{
  "__version": "1",
  "procstat": {
    "vm": {
      "841": {
        "process_id": 841,
        "vm": [
          {
            "kve_start": 0x400000,
            "kve_end": 0x8f9000,
...


For XML output PID is used as name the element while XML element name must
start with letter or underscore. Here is an example:

<procstat __version="1">
  <vm>
    <841>
      <process_id>841</process_id>
      <vm>
...

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