Added documentation of the SVG symbol type to the symbol document (#3…

…671)

git-svn-id: http://svn.osgeo.org/mapserver/trunk@13306 7532c77e-422f-0410-93f4-f0b67bdd69e2

en/mapfile/symbol.txt

@@ -50,9 +50,9 @@ ANCHORPOINT [x] [y]
       specifies the center of the symbol (in the y direction).
 
     `ANCHORPOINT` can be used with `SYMBOL`\s of `TYPE` `ellipse`,
-    `pixmap`, `truetype` and `vector`.  To ensure proper behaviour for
-    vector symbols, the left and top edges of the bounding box of the
-    symbol should be at 0.
+    `pixmap`, `svg`, `truetype` and `vector`.  To ensure proper
+    behaviour for vector symbols, the left and top edges of the
+    bounding box of the symbol should be at 0.
 
     .. versionadded:: 6.2
 
@@ -199,18 +199,23 @@ TRANSPARENT [color index]
 .. index::
    triple: SYMBOL; TYPE; simple
 
+.. index::
+   triple: SYMBOL; TYPE; svg
+
 .. index::
    triple: SYMBOL; TYPE; truetype
 
 .. index::
    triple: SYMBOL; TYPE; vector
 
-TYPE [ellipse|hatch|pixmap|simple|truetype|vector]
+TYPE [ellipse|hatch|pixmap|simple|svg|truetype|vector]
     -  `ellipse`: radius values in the x and y directions define an ellipse.
     -  `hatch`: produces hatched lines throughout the (polygon) shape.
     -  `pixmap`: a user supplied image will be used as the symbol.
     -  `simple`: default symbol type (1 pixel point, 1 pixel line, solid
        fill).
+    -  `svg`: scalable vector graphics (SVG) symbol.  Requires the
+       libsvg-cairo library.
     -  `truetype`: TrueType font to use as defined in the :ref:`MAP`
        :ref:`FONTSET`\.
     -  `vector`: a vector drawing is used to define the shape of the symbol.