SE Symbolizer version 1.1.0 (2010-02-01) Symbology Encoding is an OGC Standard. Copyright (c) 2005,2010 Open Geospatial Consortium. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ . A "SymbolizerType" is an abstract type for encoding the graphical properties used to portray geographic information. Concrete Symbolizer types are derived from this base type. A "BaseSymbolizer" defines the default properties of a Symbolizer to be those of an external Symbolizer, which will frequently be inside of an OGC Symbolizer repository. The Symbolizer properties given in-line override the base-Symbolizer properties. LINE Symbolizer A LineSymbolizer is used to render a "stroke" along a linear geometry. A Geometry gives reference to a (the) geometry property of a feature to be used for rendering. A "Stroke" specifies the appearance of a linear geometry. It is defined in parallel with SVG strokes. The following SvgParameters may be used: "stroke" (color), "stroke-opacity", "stroke-width", "stroke-linejoin", "stroke-linecap", "stroke-dasharray", and "stroke-dashoffset". Others are not officially supported. A "SvgParameter" refers to an SVG/CSS graphical-formatting parameter. The parameter is identified using the "name" attribute and the content of the element gives the SVG/CSS-coded value. The "ParameterValueType" uses WFS-Filter expressions to give values for SE graphic parameters. A "mixed" element-content model is used with textual substitution for values. A "GraphicFill" defines repeated-graphic filling (stippling) pattern for an area geometry. A "GraphicStroke" defines a repeated-linear graphic pattern to be used for stroking a line. Initialgap defines the initial empty space, before the first Graphic or Label should be rendered. Gap defines the empty space between two Graphics or Labels. POLYGON Symbolizer A "PolygonSymbolizer" specifies the rendering of a polygon or area geometry, including its interior fill and border stroke. A "Fill" specifies the pattern for filling an area geometry. The allowed SvgParameters are: "fill" (color) and "fill-opacity". POINT Symbolizer A "PointSymbolizer" specifies the rendering of a "graphic Symbolizer" at a point. A "Graphic" specifies or refers to a "graphic Symbolizer" with inherent shape, size, and coloring. An "ExternalGraphic" gives a reference to a raster or vector graphical object, either online or inline, in an externally-defined graphic format. A "Mark" specifies a geometric shape and applies coloring to it. TEXT Symbolizer A "TextSymbolizer" is used to render text labels according to various graphical parameters. A "Label" specifies the textual content to be rendered. A "Font" element specifies the text font to use. The allowed SvgParameters are: "font-family", "font-style", "font-weight", and "font-size". The "LabelPlacement" specifies where and how a text label should be rendered relative to a geometry. The present mechanism is poorly aligned with CSS/SVG. A "PointPlacement" specifies how a text label should be rendered relative to a geometric point. An "AnchorPoint" identifies the location inside of a text label to use an an 'anchor' for positioning it relative to a point geometry. A "Displacement" gives X and Y offset displacements to use for rendering a text label, graphic or other Symbolizernear a point. A "LinePlacement" specifies how a text label should be rendered relative to a linear geometry. A "PerpendicularOffset" gives the perpendicular distance away from a line to draw a label. A "Halo" fills an extended area outside the glyphs of a rendered text label to make the label easier to read over a background. RASTER Symbolizer A "RasterSymbolizer" is used to specify the rendering of raster/matrix-coverage data (e.g., satellite images, DEMs). "ChannelSelection" specifies the false-color channel selection for a multi-spectral raster source. "OverlapBehavior" tells a system how to behave when multiple raster images in a layer overlap each other, for example with satellite-image scenes. A "ColorMap" defines either the colors of a pallette-type raster source or the mapping of numeric pixel values to colors. "ContrastEnhancement" defines the 'stretching' of contrast for a channel of a false-color image or for a whole grey/color image. Contrast enhancement is used to make ground features in images more visible. "ShadedRelief" specifies the application of relief shading (or "hill shading") to a DEM raster to give it somewhat of a three-dimensional effect and to make elevation changes more visible. "ImageOutline" specifies how individual source rasters in a multi-raster set (such as a set of satellite-image scenes) should be outlined to make the individual-image locations visible. Function element Numeric formatting function Function for formatting numbers to make them human readable. Date formatting function Function for dates. String formatting functions Returns substrings. Concatenates strings. Changes the case of strings. Strips off chars from a string value Returns position of first occurence of a substring Returns length of string Categorize function The transformation of continuous values to distinct values. Interpolate function The transformation of continuous values to a number of values. Transformation of discrete values to other values