## show schema (you can still provide customized one)
## empty beause they are all NULL
Metadata()
## show schema
Metadata()$show(TRUE)
## or
names(Metadata()$asList(TRUE))
## returned meta field is actually define as function too, direclty
## call them will give you details
platform()
paired_end()
quality_scale()
## check their suggested value and construct your metadata
Metadata(platform = "Affymetrix SNP Array 6.0", paired_end = 1, quality_scale = "sanger")
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