Layer specific information is defined by elements of the catalog which implements the layer. That is, they are defined by individual elements, such as <wms:CRS>, that are child elements of the Catalog
element.
Here is an example of the WMS layer information for a catalog listed in the catalogs.xml:
<wms:Layer>
<wms:Title>GeoEye Missouri - RGB</wms:Title>
<wms:KeywordList>
<wms:Keyword>Missouri</wms:Keyword>
<wms:Keyword>Geoeye</wms:Keyword>
<wms:Keyword>satellite</wms:Keyword>
</wms:KeywordList>
<wms:CRS>EPSG:4326</wms:CRS>
<wms:CRS>EPSG:3857</wms:CRS>
<wms:Attribution>
<wms:Title>Dataset provided courtesy MJ Harden/GeoEye</wms:Title>
</wms:Attribution>
<wms:AuthorityURL name="DIF_ID">
<wms:OnlineResource xlink:href="http://www.university.edu"/>
</wms:AuthorityURL>
<wms:Identifier authority="http://bar">foo</wms:Identifier>
<wms:MetadataURL type="FGCD">
<wms:Format>text/plain</wms:Format>
<wms:OnlineResource xlink:href="http://www.university.edu"/>
</wms:MetadataURL>
<wms:FeatureListURL>
<wms:Format>JPEG</wms:Format>
<wms:OnlineResource xlink:href="http://sea-serv-image/Images/logos/LTlogo"/>
</wms:FeatureListURL>
<wms:MinScaleDenominator>1.0</wms:MinScaleDenominator>
<wms:MaxScaleDenominator>512.0</wms:MaxScaleDenominator>
</wms:Layer>