This schema defines drawing extensions for the GPX 1.1 schema (http://www.topografix.com/GPX/1/1/gpx.xsd). Elements in this schema should be used as child elements of the "extensions" element defined by the GPX schema. The color of the element, i.e. #RRGGBB or #RRGGBBAA. Note that applications should apply possible alpha values to the lines and opacity to the whole track. This means that overlapping parts of the track with alpha values will look more intense than individual lines, whereas the opacity affects the whole track including overlapping parts. The opacity of the element between 0.00 and 1.00. The width of the line in pixels, applications may use a width relative to this value if required. The dash pattern of the line, see gpxd:dashPattern_type. Should always be relative to the width. The hexColor_type must be a # followed by a 6 or 8-digit hex representation of the color (with or without the alpha value). The opacity_type must be a decimal value between 0 and 1. The dashPattern_type can be - a representation of the pattern as y-n-y-n-... with y being the relative length of the line that is visible and n being the relative length of the line that is hidden to create a dashed / dotted line. Has to have an even number of segments (at least two) and can contain multi-digit numbers. - one of the following predefined values: none, dash-long, dash-medium, dash-short, dot-sparse, dot-normal, dot-dense, dash-dot, dash-dot-dot