From: Alexander J. Vincent <ajvincent@hotmail.com>

Date: Sun, 27 Aug 2000 13:53:24 PDT

To: www-svg@w3.org

Message-ID: <F117J2TUSzbAUfKRfcj00000172@hotmail.com>

Date: Sun, 27 Aug 2000 13:53:24 PDT

To: www-svg@w3.org

Message-ID: <F117J2TUSzbAUfKRfcj00000172@hotmail.com>

Dear Sirs, I realize it is almost certainly too late to suggest new attributes and/or elements for the SVG language. However, I find myself wanting to add a few attributes and elements for my own purposes anyway... and unskilled in figuring out how to do so safely. I have reviewed the tutorials at zvon.org, particularly the DTD tutorial at http://www.zvon.org/xxl/DTDTutorial/General/book.html . It's an exceptionally well-written simple tutorial, but does not cover conditions in DTDs -- a factor I have to consider. At the end of this e-mail, I'm including four separate definitions for the line element in SVG -- the original, a slight amendment including an endpoints attribute, a version for handling point-slope lines, and a version for handling slope-intercept lines. (I hope at least that I've expressed the definitions correctly. SVG is my first exposure to XML.) I'm keenly interested in learning how to meld these four different definitions into one, or at least including an internal DTD/XSL stylesheet to modify the current definition, as mentioned in section 23.5 of the SVG Candidate Recommendation. Section 23.5 is somewhat confusing in one aspect -- it mentions "the entity viewExt" in the text, and then in the following code excerpt, it mentions "<!ENTITY % extView..." I don't see how these two object names are related -- is this a typo? Would you be willing to assist me briefly in putting the pieces together for a line element definition incorporating the four versions into one? The experience for me would be invaluable. Alex Vincent San Francisco, CA <!-- original definition of line --> <!ENTITY % lineExt "" > <!ELEMENT line (%descTitleMetadata;,(animate|set|animateMotion|animateColor|animateTransform %geExt;%lineExt;)*) > <!ATTLIST line %stdAttrs; %testAttrs; %langSpaceAttrs; externalResourcesRequired %Boolean; #IMPLIED class %ClassList; #IMPLIED style %StyleSheet; #IMPLIED %PresentationAttributes-FillStroke; %PresentationAttributes-Graphics; %PresentationAttributes-Markers; transform %TransformList; #IMPLIED %graphicsElementEvents; x1 %Coordinate; #IMPLIED y1 %Coordinate; #IMPLIED x2 %Coordinate; #IMPLIED y2 %Coordinate; #IMPLIED > <!-- alternate definition one: adding endpoints attribute endpoints defaults to "both", indicating line segment pt1 indicates the (x1,y1) point is an endpoint, but the (x2,y2) point is not: a ray pt2 indicates the (x2,y2) point is an endpoint, but the (x1,y1) point is not: a ray none indicates no endpoints: a geometric line, continuing through the two points. --> <!ENTITY % lineExt "" > <!ELEMENT line (%descTitleMetadata;,(animate|set|animateMotion|animateColor|animateTransform %geExt;%lineExt;)*) > <!ATTLIST line %stdAttrs; %testAttrs; %langSpaceAttrs; externalResourcesRequired %Boolean; #IMPLIED class %ClassList; #IMPLIED style %StyleSheet; #IMPLIED %PresentationAttributes-FillStroke; %PresentationAttributes-Graphics; %PresentationAttributes-Markers; transform %TransformList; #IMPLIED %graphicsElementEvents; x1 %Coordinate; #IMPLIED y1 %Coordinate; #IMPLIED x2 %Coordinate; #IMPLIED y2 %Coordinate; #IMPLIED endpoints (both|pt1|pt2|none) "both" #IMPLIED > <!-- alternate definition two: point-slope indicates a geometric line with no endpoints, passing through (x1,y1) and (x1 + 1, y1 + slope) y = y0 + slope(x - x0) y2 = y1 + slope(x2 - x1) (x1, y1) (x2, y1 + slope(x2 - x1)) x2 = x1 + 1 (x1, y1) (x1 + 1, y1 + slope(x1 + 1 - x1)) (x1, y1) (x1 + 1, y1 + slope(1)) (x1, y1) (x1 + 1, y1 + slope) --> <!ENTITY % lineExt "" > <!ELEMENT line (%descTitleMetadata;,(animate|set|animateMotion|animateColor|animateTransform %geExt;%lineExt;)*) > <!ATTLIST line %stdAttrs; %testAttrs; %langSpaceAttrs; externalResourcesRequired %Boolean; #IMPLIED class %ClassList; #IMPLIED style %StyleSheet; #IMPLIED %PresentationAttributes-FillStroke; %PresentationAttributes-Graphics; %PresentationAttributes-Markers; transform %TransformList; #IMPLIED %graphicsElementEvents; x1 %Coordinate; #IMPLIED y1 %Coordinate; #IMPLIED slope %Number; #IMPLIED linetype (point-slope) #REQUIRED > <!-- alternate definition three: slope-intercept indicates a geometric line with no endpoints through (0, y-intercept) and (1, y-intercept + slope) --> <!ENTITY % lineExt "" > <!ELEMENT line (%descTitleMetadata;,(animate|set|animateMotion|animateColor|animateTransform %geExt;%lineExt;)*) > <!ATTLIST line %stdAttrs; %testAttrs; %langSpaceAttrs; externalResourcesRequired %Boolean; #IMPLIED class %ClassList; #IMPLIED style %StyleSheet; #IMPLIED %PresentationAttributes-FillStroke; %PresentationAttributes-Graphics; %PresentationAttributes-Markers; transform %TransformList; #IMPLIED %graphicsElementEvents; y-intercept %Coordinate; #IMPLIED slope %Number; #IMPLIED linetype (slope-intercept) #REQUIRED > _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com.Received on Sunday, 27 August 2000 16:53:56 UTC

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