Extract sub category info from XML using Google Sh

I am trying to capture elements of an qmd file (that is xml markup) using Google Sheets importxml. Based on the reply to my question Google ImportXML from QGIS metadata file I am able to capture the primary tag.

=transpose(IMPORTXML("https://drive.google.com/uc?id=1AI2C8hQnSOuuoyJXizYBszGmpMXW8xxT&export=download","//authid"))

However I can't access some elements

    <spatialrefsys>
      <proj4>+proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs</proj4>
      <srsid>2449</srsid>
      <srid>28355</srid>
      <authid>EPSG:28355</authid>
      <description>GDA94 / MGA zone 55</description>
      <projectionacronym>utm</projectionacronym>
      <ellipsoidacronym>GRS80</ellipsoidacronym>
      <geographicflag>false</geographicflag>
    </spatialrefsys>
  </crs>
  <extent>
    <spatial minx="322783.17999999999301508" minz="0" crs="EPSG:28355" maxx="337384.35999999998603016" miny="8170597.66000000014901161" maxz="0" dimensions="2" maxy="8181833.33999999985098839"/>
    <temporal>
      <period>
        <start></start>
        <end></end>
      </period>
    </temporal>
  </extent>

From the //extent I want minx, maxx

for XPath I have tried "//extent", "//extent/spatial", "//extent/spatial[@*]" and "@minx"

but get no result.

You want to retrieve the values of maxx and minx using IMPORTXML().

If my understanding is correct, how about this modification?

Modified formula:

=TRANSPOSE(IMPORTXML(A1,"//spatial/@maxx | //spatial/@minx"))

https://drive.google.com/uc?id=1AI2C8hQnSOuuoyJXizYBszGmpMXW8xxT&export=download is put in the cell "A1".
In this case, //spatial/@maxx | //spatial/@minx is used as the xpath.
- Attibute values can be retrieved with @.
When you want to use these values as the number, you can use this.

If you want to use the values as the text, for example, how about the following formula?

=TRANSPOSE(ARRAYFORMULA(TEXT(IMPORTXML(A1,"//spatial/@maxx | //spatial/@minx"),"0.0000000000")))

Result:

Reference:

IMPORTXML

If I misunderstood your question and this was not the result you want, I apologize.