Update the Add Layer "How To"

[andersd]

1. Expand the "A Mapserver layer" in Step 1 to also include:

Here is an exmaple where multiple layers are referenced in a source:

<map-source name="borders" type="mapserver" reference="true">

<file>./demo/statedata/basemap.map</file>
<layer name="city_labels" status="on"/>
<layer name="county_labels" status="on"/>
<layer name="city_poly" status="on"/>
<layer name="county_borders" status="on"/>

</map-source>

2. Step 2: Adding a Layer after the LMIC 203 FSA Aerials to include

To add the borders with multiple layers in the demo it would look like this:

layer title="City and County Boundaries" src="borders/city_labels:borders/county_labels:borders/county_borders:borders/city_poly"/>

3. Add additional options ot individual parts

legend= - This determines to show legend or not (true of false).

fade= - This determines to allow fading for the layer or not (true of false).

unfade=- This determines to allow unfading for the layer or not (true of false).

[EliL]

updated in r772

[EliL]

actually r774