(XML) Sheet xmlns value is empty

[Synthoid]

In my haste to deploy v62 I missed an obvious namespacing issue. Sheet elements are not created with namespaces:

<data xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:sa="https://www.apple.com" xmlns:sg="https://www.google.com" xmlns:sm="https://www.microsoft.com">
  <Sheet1 xmlns="">
    <sm:Excel Company="Microsoft" ss:ID="MS" />
    <sg:Sheets Company="Google" ss:ID="G" />
    <sa:Numbers Company="Apple" ss:ID="A" />
  </Sheet1>
</data>

[Synthoid]

Fixed in v63.