2.1.837 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.
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Office specifies that the XML source shall be from the URL specified by WebQuerySourceHRef in the HTML.
b. The standard states that @url may be an empty string.
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In Office @url cannot be an empty string, and must have a length less than or equal to 230 characters.
c. The standard does not state the relationship between the url, xml, and connection@deleted elements.
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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.