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+# /=====================================================================\
+# | LaTeXML-picture.rnc |
+# | RelaxNG model for LaTeXML generated documents |
+# |=====================================================================|
+# | Part of LaTeXML: |
+# | Public domain software, produced as part of work done by the |
+# | United States Government & not subject to copyright in the US. |
+# |=====================================================================|
+# | Bruce Miller <bruce.miller@nist.gov> #_# |
+# | http://dlmf.nist.gov/LaTeXML/ (o o) |
+# \=========================================================ooo==U==ooo=/
+
+# ======================================================================
+# Picture; Experimental, possibly should evolve to SVG?
+# ======================================================================
+
+default namespace = "http://dlmf.nist.gov/LaTeXML"
+namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
+
+## This module defines a picture environment, roughly a subset of SVG.
+## NOTE: Consider whether it is sensible to drop this and incorporate SVG itself.
+Misc.class &= picture*
+
+#======================================================================
+
+Picture.class =
+ g* & rect* & line* & circle* & path*
+ & arc* & wedge* & ellipse* & polygon* & bezier*
+ & parabola* & curve* & dots* & grid* & clip*
+
+## These attributes correspond roughly to SVG, but need documentation.
+Picture.attributes =
+ attribute x { text }? &
+ attribute y { text }? &
+ attribute r { text }? &
+ attribute rx { text }? &
+ attribute ry { text }? &
+ attribute width { text }? &
+ attribute height { text }? &
+ attribute fill { text }? &
+ attribute stroke { text }? &
+ attribute stroke-width { text }? &
+ attribute stroke-dasharray { text }? &
+ attribute transform { text }? &
+ attribute terminators { text }? &
+ attribute arrowlength { text }? &
+ attribute points { text }? &
+ attribute showpoints { text }? &
+ attribute displayedpoints { text }? &
+ attribute arc { text }? &
+ attribute angle1 { text }? &
+ attribute angle2 { text }? &
+ attribute arcsepA { text }? &
+ attribute arcsepB { text }? &
+ attribute curvature { text }?
+
+## These attributes correspond roughly to SVG, but need documentation.
+PictureGroup.attributes =
+ attribute pos { text }? &
+ attribute framed {xsd:boolean}? &
+ [ a:defaultValue = "rect" ]
+ attribute frametype { "rect" | "circle" | "oval" }? &
+ attribute fillframe {xsd:boolean }? &
+ attribute boxsep { text }? &
+ attribute shadowbox {xsd:boolean}? &
+ attribute doubleline {xsd:boolean}?
+
+#======================================================================
+
+picture =
+## A picture environment.
+element picture { picture_attributes & picture_model }
+
+## Attributes for \elementref{picture}.
+picture_attributes =
+ Common.attributes &
+ ID.attributes &
+ Picture.attributes &
+ Imageable.attributes &
+ attribute clip {xsd:boolean}? &
+ attribute baseline { text }? &
+ attribute unitlength { text }? &
+ attribute xunitlength { text }? &
+ attribute yunitlength { text }? &
+ attribute tex { text }? &
+ attribute content-tex { text }?
+
+## Content model for \elementref{picture}.
+picture_model = Picture.class & Inline.class & Misc.class & Meta.class
+
+#======================================================================
+
+g =
+## A graphical grouping; the content is inherits by the transformations,
+## positioning and other properties.
+element g { g_attributes & g_model }
+
+## Attributes for \elementref{g}.
+g_attributes = Common.attributes & Picture.attributes & PictureGroup.attributes
+
+## Content model for \elementref{g}.
+g_model = Picture.class & Inline.class & Misc.class & Meta.class
+
+#======================================================================
+
+rect =
+## A rectangle within a \elementref{picture}.
+element rect { rect_attributes & rect_model }
+
+## Attributes for \elementref{rect}.
+rect_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{rect}.
+rect_model = empty
+
+#======================================================================
+
+line =
+## A line within a \elementref{picture}.
+element line { line_attributes & line_model }
+
+## Attributes for \elementref{line}.
+line_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{line}.
+line_model = empty
+
+#======================================================================
+
+polygon =
+## A polygon within a \elementref{picture}.
+element polygon { polygon_attributes & polygon_model }
+
+## Attributes for \elementref{polygon}.
+polygon_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{polygon}.
+polygon_model = empty
+
+#======================================================================
+
+wedge =
+## A wedge within a \elementref{picture}.
+element wedge { wedge_attributes & wedge_model }
+
+## Attributes for \elementref{wedge}.
+wedge_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{wedge}.
+wedge_model = empty
+
+#======================================================================
+
+arc =
+## An arc within a \elementref{picture}.
+element arc { arc_attributes & arc_model }
+
+## Attributes for \elementref{arc}.
+arc_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{arc}.
+arc_model = empty
+
+#======================================================================
+
+circle =
+## A circle within a \elementref{picture}.
+element circle { circle_attributes & circle_model }
+
+## Attributes for \elementref{circle}.
+circle_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{circle}.
+circle_model = empty
+
+#======================================================================
+
+ellipse =
+## An ellipse within a \elementref{picture}.
+element ellipse { ellipse_attributes & ellipse_model }
+
+## Attributes for \elementref{ellipse}.
+ellipse_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{ellipse}.
+ellipse_model = empty
+
+#======================================================================
+
+path =
+## A path within a \elementref{picture}.
+element path { path_attributes & path_model }
+
+## Attributes for \elementref{path}.
+path_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{path}.
+path_model = empty
+
+#======================================================================
+
+bezier =
+## A bezier curve within a \elementref{picture}.
+element bezier { bezier_attributes & bezier_model }
+
+## Attributes for \elementref{bezier}.
+bezier_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{bezier}.
+bezier_model = empty
+
+#======================================================================
+
+curve =
+## A curve within a \elementref{picture}.
+element curve { curve_attributes & curve_model }
+
+## Attributes for \elementref{curve}.
+curve_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{curve}.
+curve_model = empty
+
+#======================================================================
+
+parabola =
+## A parabola curve within a \elementref{picture}.
+element parabola { parabola_attributes & parabola_model }
+
+## Attributes for \elementref{parabola}.
+parabola_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{parabola}.
+parabola_model = empty
+
+#======================================================================
+
+dots =
+## A sequence of dots (?) within a \elementref{picture}.
+element dots { dots_attributes & dots_model }
+
+## Attributes for \elementref{dots}.
+dots_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{dots}.
+dots_model = empty
+
+#======================================================================
+
+grid =
+## A grid within a \elementref{picture}.
+element grid { grid_attributes & grid_model }
+
+## Attributes for \elementref{grid}.
+grid_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{grid}.
+grid_model = empty
+
+#======================================================================
+
+clip =
+## Establishes a clipping region within a \elementref{picture}.
+element clip { clip_attributes & clip_model }
+
+## Attributes for \elementref{clip}.
+clip_attributes = Common.attributes & Picture.attributes
+
+
+## Content model for \elementref{clip}.
+clip_model = clippath*
+
+#======================================================================
+
+clippath =
+## Establishes a clipping region within a \elementref{picture}.
+element clippath { clippath_attributes & clippath_model }
+
+## Attributes for \elementref{clippath}.
+clippath_attributes = Common.attributes & Picture.attributes
+
+## Content model for \elementref{clippath}.
+clippath_model = Picture.class & Inline.class & Misc.class & Meta.class
+
+#======================================================================