Relax NG Compact format

Hello,

Currently I am doing API call to my application thru PowerQuery in xml format & getting responce in json.
Application I am using has another option to retrive data in Relax NG, is it supported by Power BI?

Here is code example from white paper:

default namespace = ""
start =
element call {
attribute callerName { text },
attribute method { "customReportValues" },
element credentials {
attribute instanceCode { text },
attribute login { text },
attribute locale { text }?,
(attribute password { text } | attribute ticket{ text })
},
element report {
attribute suppress-zeroes { "0" | "1" | "2" }?, #0=Nothing suppressed, 1=Suppress blank cells but
not zeroes, 2=Suppress blank and zero cells(Default)
attribute show-cell-notes { "0" | "1" }?, #0=Don't show cell notes(default), 1=show cell notes
X-axis, # Axes must be specified in order X, Y, (optional) FILTER
Y-axis,
Filter-axis?
}
}
X-axis =
element axis {
attribute type { "X" },
segment+
}
Y-axis =
element axis {
attribute type { "Y" },
segment+
}
Filter-axis =
element axis {
attribute type { "FILTER" },
segment
}
segment =
element segment {
(dimTier | levelTier | accTier | timeTier | versionTier | currencyTier | accAttrTier |
levelAttrTier | dimAttrTier)+
}
#Look up ids by calling the exportDimensions API
dimTier =
element tier {
attribute type { "dim" },
attribute entity-id { xsd:integer }, #dimension id
(stdRollup | stdEl)+ #stdRollup will allow for arbitrary rollups and stdEl will provide the
dimension value id
}
#Look up ids by calling the exportLevels API
levelTier =
element tier {
attribute type { "lvl" },