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/usr/share/lyx/layouts/jss.layout is in lyx-common 2.2.2-1.

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#% Do not delete the line below; configure depends on this      
#  \DeclareLaTeXClass[jss,ae.sty,color.sty,fancyvrb.sty,hyperref.sty,natbib.sty,upquote.sty]{Journal of Statistical Software (JSS) version 2}
#  \DeclareCategory{Articles}
# Journal of Statistical Software (JSS) article textclass definition file
# Author: Andreas Karlsson <andreas.karlsson@ltv.se>
#         Phil Chalmers <rphilip.chalmers@gmail.com>
#         Uwe Stöhr <uwestoehr@lyx.org>
# License: GNU GPL version 2 or later
# JSS LaTeX files can be downloaded from http://www.jstatsoft.org/downloads/JSSstyle.zip

Format 60

# Read the definitions from article.layout
Input article.layout

# The commented macro below is enough to prevent Sweave from loading
# Sweave.sty. This is needed because jss.cls already provides
# this package's functionality (see bug 7555).
AddToPreamble
    %\usepackage{Sweave}
EndPreamble

NoStyle "Right Address"

Style Section
	LabelString			\thesection.
End

Style Subsection
	LabelString			\thesubsection.
End

Style Subsubsection
	LabelType			No_Label
	Font
	  Shape				Italic
	EndFont
End

Style Title
	InPreamble			1
	Font
	  Size				Huge
	EndFont
End

Style Author
	InPreamble			1
End

Style Abstract
	Category			FrontMatter
	LatexName			Abstract
	LatexType			Command
	InTitle				1
	InPreamble			1
	Margin				Dynamic
	LeftMargin			M
	NextNoIndent		1
	ParSkip				0.4
	BottomSep			1.5
	TopSep				1.5
	ParSep				1.5
	TopSep				0.8
	BottomSep			0.8
	AlignPossible		Block, Left, Right, Center
	Labeltype			Centered
	LabelString			"Abstract"
	LabelFont
	  Series			Bold
	EndFont
End

Style Address
	CopyStyle			Abstract
	LatexName			Address
	LabelType			Above
	LabelString			"Affiliation:"
	Margin				Static
	LeftMargin			M
	Labelsep			M
	LabelFont
	  Size				normal
	EndFont
End

Style Keywords
	Margin				Dynamic
	LatexType			Command
	LatexName			Keywords
	Category			FrontMatter
	InTitle				1
	InPreamble			1
	NextNoIndent		1
	BottomSep			0.5
	ParSkip				0.4
	Align				Block
	LabelSep			xx
	LabelType			Static
	LabelString			"Keywords:"
	LabelFont
	  Color				Green
	  Series			Bold
	EndFont
End

Style "Plain Keywords"
	CopyStyle			Keywords
	LatexName			Plainkeywords
	LabelString			"Plain Keywords:"
End

Style "Plain Title"
	CopyStyle			Keywords
	LatexName			Plaintitle
	LabelString			"Plain Title:"
End

Style "Short Title"
	CopyStyle			Keywords
	LatexName			Shorttitle
	LabelString			"Short Title:"
End

Style "Plain Author"
	CopyStyle			Keywords
	LatexName			Plainauthor
	LabelString			"Plain Author:"
End

InsetLayout "Flex:Pkg"
	LyxType				custom
	LabelString			pkg
	LatexType			command
	LatexName			pkg
	Font
	  Color				foreground
	  Size				Small
	  Family			Roman
	  Shape				Up
	  Series			Medium
	  Misc				No_Emph
	  Misc				No_Noun
	  Misc				No_Bar
	  Series			Bold
	EndFont
	LabelFont
	  Color				latex
	  Size				Small
	EndFont
	HTMLTag				pkg
	ResetsFont			true
	spellcheck			false
End

InsetLayout "Flex:Proglang"
	CopyStyle			"Flex:Pkg"
	LabelString			proglang
	LatexName			proglang
	Font
	  Family			Typewriter
	  Series			Medium
	EndFont
	LabelFont
	  Color				latex
	  Size				Small
	EndFont
	HTMLTag				proglang
End

InsetLayout "Flex:Code"
	CopyStyle			"Flex:Proglang"
	Spellcheck			0
	LabelString			code
	LatexName			code
	HTMLTag				code
End

InsetLayout "Flex:E-mail"
	CopyStyle			"Flex:URL"
	LabelString			E-mail
	LatexName			email
	HTMLTag				email
End

InsetLayout "Flex:Code Chunk"
	CopyStyle			"Flex:Pkg"
	LatexType			Environment
	LatexName			CodeChunk
	Decoration			Classic
	Spellcheck			0
	ParbreakIsNewline	1
	FreeSpacing			1
	PassThru			1
	KeepEmpty			1
	LabelString			"Code Chunk"
	Font
	  Family			Typewriter
	EndFont
	LabelFont
	  Color				Green
	EndFont
End

Style "Code"
	LatexName			Code
	LabelString			"Code"
	LatexType			Environment
	LatexName			Code
	Spellcheck			0
	NextNoIndent		1
	ParbreakIsNewline	1
	FreeSpacing			1
	PassThru			1
	KeepEmpty			1
	NewLine				0
	TopSep				0
	BottomSep			0
	Align				Block
	AlignPossible		Block
	Labeltype			Above
	Font
	  Family			Typewriter
	EndFont
	LabelFont
	  Series			Bold
	  Color				Green
	EndFont
	HTMLTag				<pre></pre>
	HTMLItem			p
End

Style "Code Input"
	CopyStyle			"Code"
	LatexName			CodeInput
	LabelString			"Code Input"
End

Style "Code Output"
	CopyStyle			"Code"
	LatexName			CodeOutput
	LabelString			"Code Output"
End