schemaLocation is not really supported

[ronaldtse]

In XML files there are many occasions that alongside an XML namespace declaration, a schemaLocation is also provided.

e.g.

         -<?xml version="1.0" encoding="UTF-8"?>
         -<gml:Dictionary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:gml="http://www.opengis.net/gml/3.2" xsi:schemaLocation="http://www.opengis.net/gml http://schemas.opengis.net/gml/3.1.1/profiles/SimpleDictionary/1.0.0/gmlSimpleDictionaryProfile.xsd" gml:id="cl_e3c8f730-a2a0-4883-bf3c-1c8dcefdf693">
         +<?xml version="1.0" encoding="utf-8"?>
         +<gml:Dictionary xmlns:gml="http://www.opengis.net/gml/3.2" gml:id="cl_e3c8f730-a2a0-4883-bf3c-1c8dcefdf693">

Notice that in the original <gml:Dictionary> it contains schemaLocation. However, in Shale I have to manually encode schemaLocation as a data attribute, which is quite crazy.

[ronaldtse]

The workaround is actually this:

class SomeClass < Shale::Mapper
  attribute :schema_location, Shale::Type::String

  xml do
    root "Dictionary"

    map_attribute "schemaLocation", to: :schema_location, prefix: "xsi", namespace: "http://www.w3.org/2001/XMLSchema-instance"
end