Validate an XML document against an XML 1.0 schema.
Examples
# Example from https://msdn.microsoft.com/en-us/library/ms256129(v=vs.110).aspx
doc <- read_xml(system.file("extdata/order-doc.xml", package = "xml2"))
schema <- read_xml(system.file("extdata/order-schema.xml", package = "xml2"))
xml_validate(doc, schema)
#> [1] TRUE
#> attr(,"errors")
#> character(0)