From GridLAB-D Wiki
The --xsl command line option is used to generate an Extensible Stylesheet Language (XSL) document for GridLAB-D modules and for the core objects. XSL data is used to render and transform XML data.
Command line
To generate an XSL document for a set of modules, use the syntax
host% gridlabd --xsl module_1,module_2,...,module_N
The output will be written to a file entitled gridlabd-major_minor.xls, where major is the major version of GridLAB-D and minor is the minor version of GridLAB-D.