This directory contains classes that are derived from SPObject as well as closely related code.

The object tree implements an XML-to-display primitive mapping, and
provides an object hierarchy that can be modified using the
GUI. Changes in the XML tree are automatically propagated to the
object tree via observers, but not the other way around — a function
called updateRepr() must be explicitly called. Relevant nodes of the
object tree contains fully cascaded CSS style information. The object
tree also includes clones of objects that are referenced by the <use>
element in the XML tree (this is needed as clones may have different
styling due to inheritance).

See: http://wiki.inkscape.org/wiki/index.php/Object_tree

Object class inheritance:

sp-object.h:
  color-profile.h:    class ColorProfile
  persp3d.h:          class Persp3D
  sp-defs.h:          class SPDefs
  sp-desc.h:          class SPDesc
  sp-filter.h:        class SPFilter
  sp-flowdiv.h:       class SPFlowline
  sp-flowdiv.h:       class SPFlowregionbreak
  sp-font-face.h:     class SPFontFace
  sp-font.h:          class SPFont
  sp-glyph.h:         class SPGlyph
  sp-glyph-kerning.h: class SPGlyphKerning
    sp-glyph-kerning.h: class SPHkern
    sp-glyph-kerning.h: class SPVkern
  sp-guide.h:         class SPGuide
  sp-hatch-path.h:    class SPHatchPath
  sp-item.h:          class SPItem
    sp-flowdiv.h:       class SPFlowdiv
    sp-flowdiv.h:       class SPFlowtspan
    sp-flowdiv.h:       class SPFlowpara
    sp-flowregion.h:    class SPFlowregion
    sp-flowregion.h:    class SPFlowregionExclude
    sp-flowtext.h:      class SPFlowtext
    sp-image.h:         class SPImage
    sp-lpe-item.h:      class SPLPEItem
      sp-item-group.h:    class SPGroup
        box3d.h:            class SPBox3D
        sp-anchor.h:        class SPAnchor
        sp-marker.h:        class SPMarker
        sp-root.h:          class SPRoot
        sp-switch.h:        class SPSwitch
        sp-symbol.h:        class SPSymbol
      sp-shape.h:         class SPShape
        sp-ellipse.h:       class SPGenericEllipse
        sp-line.h:          class SPLine
        sp-offset.h:        class SPOffset
        sp-path.h:          class SPPath
        sp-polygon.h:       class SPPolygon
          sp-star.h:          class SPStar
        sp-polyline.h:      class SPPolyLine
          box3d-side.h:       class Box3DSide
        sp-rect.h:          class SPRect
        sp-spiral.h:        class SPSpiral
    sp-text.h:          class SPText
    sp-textpath.h:      class SPTextPath
    sp-tref.h:          class SPTRef
    sp-tspan.h:         class SPTSpan
    sp-use.h:           class SPUse
  sp-mesh-patch.h:    class SPMeshpatch
  sp-mesh-row.h:      class SPMeshrow
  sp-metadata.h:      class SPMetadata
  sp-missing-glyph.h: class SPMissingGlyph
  sp-object-group.h:  class SPObjectGroup
    sp-clippath.h:      class SPClipPath
    sp-mask.h:          class SPMask
    sp-namedview.h:     class SPNamedView
  sp-paint-server.h:  class SPPaintServer
    sp-gradient.h:      class SPGradient
      sp-linear-gradient.h: class SPLinearGradient
      sp-mesh-gradient.h:   class SPMeshGradient
      sp-radial-gradient.h: class SPRadialGradient
    sp-hatch.h:         class SPHatch
    sp-pattern.h:       class SPPattern
    sp-solid-color.h:   class SPSolidColor
  sp-script.h:        class SPScript
  sp-stop.h:          class SPStop
  sp-string.h:        class SPString
  sp-style-elem.h:    class SPStyleElem
  sp-tag.h:           class SPTag
  sp-tag-use.h:       class SPTagUse
  sp-title.h:         class SPTitle

Other related files:

  object-set.h:
  persp3d-reference.h
  sp-conn-end-pair.h
  sp-conn-end.h
  sp-dimensions.h
  sp-factory.h
  sp-filter-reference.h
  sp-filter-units.h
  sp-gradient-reference.h
  sp-gradient-spread.h
  sp-gradient-units.h
  sp-gradient-vector.h
  sp-item-rm-unsatisfied-cns.h
  sp-item-transform.h
  sp-item-update-cns.h
  sp-marker-loc.h
  sp-mesh-array.h
  sp-paint-server-reference.h
  sp-tag-use-reference.h
  sp-tref-reference.h
  sp-use-reference.h
  style-enums.h
  style-internal.h
  style.h
  uri.h
  uri-references.h
  viewbox.h