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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi Guillermo,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>This is what I currently have in the model for Expressions.<o:p></o:p></p><p class=MsoNormal>I will circulate the full model when I have made updates resulting from the meeting.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Note that if we remove the Value attribute, and assume that Literals are also specified in the Expression string, we will need also to be able to specify Literal values of any type in the expression field.<o:p></o:p></p><p class=MsoNormal>It does have the advantage, however, that we remove any polymorphism problem from the Expression structure, as we will not require special Object/Position/Direction Expression types.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The full set of Argument Types supported is:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-GB'><img width=200 height=390 id="Picture_x0020_2" src="cid:image002.png@01D54C5E.E22107F0"></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Of these, the majority are various Numeric types, so we would need to be able to represent literals for both integer and real values potentially with exponents.<o:p></o:p></p><p class=MsoNormal>Other types for which we will need literal representations are:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Boolean<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Duration, Time, FineTime<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>String (should be easy!)<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>URI<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>ObjectID: This is essentially the Object reference we need to support anyway<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Direction and Position<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Blob (binary data) – should this only be supported by reference?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I would expect that there will be standard representations for Numeric, Boolean, Duration, Time, String and URI types.<o:p></o:p></p><p class=MsoNormal>Hopefully XPath would also provide support for Object References.<o:p></o:p></p><p class=MsoNormal>Direction, Position and Blob may be more difficult. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-GB'><img width=990 height=800 id="Picture_x0020_1" src="cid:image004.png@01D54C5E.E22107F0"></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Roger<o:p></o:p></p></div></body></html>