2.1.828 Part 1 Section 18.13.13, webPr (Web Query Properties)
a. The standard describes @sourceData as a flag indicating if XML source data should be imported instead of HTML.
Office specifies that the XML source shall be from the URL specified by WebQuerySourceHRef in the HTML.
b. The standard states that @url is may be an empty string.
In Office @url cannot be an empty string.
c. The standard does not state the relationship between the url, xml, and connection@deleted elements.
In Office, if @xml= true and the @deleted of the parent connection element is false, a non-empty @url shall be specified. If @xml is false, @url shall be specified if the @deleted of the parent connection element is false and not specified otherwise.