xml:space="preserve" not honored

[jeff-emanuel]

foo.xml:

<?xml version="1.0" encoding="UTF-8"?>
<foo>
  <v xml:space="preserve"> Keep the space</v>
</foo>

julia> foo = read("foo.xml", Node)
Node Document (2 children)

julia> foo[2]
Node Element <foo> (1 child)

julia> foo[2][1]
Node Element <v xml:space="preserve"> (1 child)

julia> foo[2][1][1]
Node Text "Keep the space"

julia> foo[2][1][1].value
"Keep the space"

julia> XML.write(foo)
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<foo>\n  <v xml:space=\"preserve\">Keep the space</v>\n</foo>\n"

Both EzXML.jl and LightXMLjl preserve the space, but I can't use those directly. I'm using XLSX.jl which uses XML.jl in its latest code, and this issue is corrupting my data.

[TimG1964]

This issue creates a bug in XLSX that will need a workaround until fixed

julia> using XML

julia> using XLSX
Precompiling XLSX...
  1 dependency successfully precompiled in 10 seconds. 27 already precompiled.

julia> s=XML.Element("si")
Node Element <si>

julia> push!(s, XML.Element("t", XML.Text("    ")))
1-element Vector{Node}:
 Node Element <t> (1 child)

julia> s[1]["xml:space"]="preserve"
"preserve"

julia> println(XML.write(s))
<si>
  <t xml:space="preserve">    </t>
</si>

julia> XLSX.unformatted_text(s)   # So far so good!
"    "

julia> io=IOBuffer()
IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=0, maxsize=Inf, ptr=1, mark=-1)

julia> XML.write(io, s)

julia> seekstart(io)
IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=45, maxsize=Inf, ptr=1, mark=-1)

julia> new=XML.read(io, Node)
Node Document (1 child)

julia> XLSX.unformatted_text(new) # Now the space has gone and the node has no `Text` child to find.
"<t xml:space=\"preserve\"/>"