I am new to this and a confused about this.  I got these comments in the schema validation box. 
   * Target: [standalone schema assessment]
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    * schemaDocs: [ External links are visible to forum administrators only ]
    * The schema(s) used for schema-validation had
        no errors
    * The target was not assessed
AND
Low-level XML well-formedness and/or validity processing output
Error: scheme "https" not implemented
AND
Schema resources involved
Schema resources involved
Attempt to load a schema document from
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 (source: command line) for
   no namespace,
    failed:
couldn't open
Is the sitemap OK to upload or are these issues that need to be addressed first?  If so, what and how?