Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 123]

▼Nsvg
Carea
▼Ccircle_element
Cdata
Ccollection_rstate	Collection derived states
Ccolor_qf
Ccolor_qi	Color quantified as integral RGB components in the range [0,255]. aka like Scalar in OpenCV
Ccolor_rstate	Render settings for collections
Cdefs_element
Cdesc_element
Celement_base	Abstract base class for all SVG Elements
Cfilter_element
Cforeign_element
Cgradient_element
Cgraph_rstate	Per-graph constants, metadata, text
Cgroup_element
Cid_rstate	Named render state. Datum to take id string and tie it to visual representation
Ciframe_element	Iframe HTML object embedded in SVG container. NB: HTML elements video/audio/iframe/canvas can be used w/o foreignElement. This approach uses HTML wrapped in foreign element. https://www.w3.org/TR/SVG2/embedded.html#HTMLElements https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe
▼Cimage_element
Cdata
▼Cline_element
Cdata
Clinear_gradient	Linear gradients https://developer.mozilla.org/en-US/docs/Web/SVG/Element/linearGradient
Clink_element
Cmarker_element
Cobject_element	HTML object embedded in SVG container. Unlike image_elements, object_elements are not locked down for scripting. NB: HTML elements video/audio/object/canvas can be used w/o foreignElement. This approach uses HTML wrapped in foreign element. https://www.w3.org/TR/SVG2/embedded.html#HTMLElements https://developer.mozilla.org/en-US/docs/Web/HTML/Element/object
▼Cpath_element
Cdata
Cpolyline_element
Cradial_gradient	Circular gradients https://developer.mozilla.org/en-US/docs/Web/SVG/Element/radialGradient
▼Crect_element
Cdata
Crender_state_base	Settings for glyph, graphic, chart, and collection object render
Cscript_element
▼Cstring	STL class
Cconst_iterator	STL iterator class
Cconst_reverse_iterator	STL iterator class
Citerator	STL iterator class
Creverse_iterator	STL iterator class
Cstroke_style	Additional path/line/polyline stroke styles
Cstyle	Datum consolidating style preferences
Csvg_element
▼Ctext_element
Cdata
Ctext_path_element
Ctitle_element
Ctransform	Datum consolidating transform possibilities. https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/transform
Ctypography
Cvideo_element	Video HTML object embedded in SVG container. NB: HTML elements video/audio/iframe/canvas can be used w/o foreignElement. This approach uses HTML wrapped in foreign element. https://www.w3.org/TR/SVG2/embedded.html#HTMLElements https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video