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

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The actual contents of the file can be viewed below.

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#% Do not delete the line below; configure depends on this
#  \DeclareLaTeXClass[seminar,sem-page.sty]{Seminar}
#  \DeclareCategory{Presentations}
# Versions:
#   1.0 Initial attemt at makeing a LyX layout file for the seminar class.
#       Author : Lars Gullik Bjønnes <larsbj@lyx.org>
#   1.1 08-04-2002 Günter Milde <milde users.sf.net>
#   1.2 11-12-2002 Günter Milde (copying some stuff from L. G. Bjønnes
#                                version in LyX 1.3)
#   1.3 2007-09-18 Günter Milde (adapted to LyX 1.5)
#   1.4 2008-10-08 Günter Milde (use --Separator-- "look")
#   1.5 2011-06-09 Günter Milde (Use Flex insets)

Format 60
Sides	1
Columns	1

ClassOptions
	FontSize	8|9|10|11|12|14|17
	Other		"slidesec,semrot,portrait"
End

# Input general definitions: (seminar is based on the article class)
Input article.layout

InsetLayout Flex:LandscapeSlide
	LabelString	"Landscape Slide"
	LatexType	Environment
	LatexName	slide
	LyXType		custom
	Decoration	classic
	MultiPar	true
	KeepEmpty		true
	LabelFont
		Size	Small
	EndFont
	ResetsFont true
End

InsetLayout Flex:PortraitSlide
	CopyStyle	Flex:LandscapeSlide
	LabelString	"Portrait Slide"
	LatexName	slide*
End

# Note: \slideheading is only defined when the option slidesec is present
Style SlideHeading
	CopyStyle		Section*
	LatexName		slideheading
	Align			Center
End

# Note: \slidesubheading is only defined when the option slidesec is present
Style SlideSubHeading
	CopyStyle		Subsection*
	LatexName		slidesubheading
	Align			Center
End

InsetLayout Flex:ListOfSlides
	CopyStyle		Flex:LandscapeSlide
	LabelString		"List of Slides"
	LatexType		Command
	LatexName		listofslides
	BgColor			listingsbg
	Spellcheck		0
End

InsetLayout Flex:SlideContents
	CopyStyle		Flex:ListOfSlides
	LabelString		"Slide Contents"
	LatexName		slidecontents
End

InsetLayout Flex:ProgressContents
	CopyStyle		Flex:ListOfSlides
	LabelString		"Progress Contents"
	LatexName		Slidecontents
End

# Compatibility definitions for old documents
# -------------------------------------------
#
# It is recommended to use the custom insets instead of paragraph styles.

Style LandscapeSlide
	Category		MainText
	KeepEmpty		1
	LatexType		Environment
	LatexName		slide
	NextNoIndent		1
	Margin			Static
	LeftMargin		N
	ParIndent		""
	TopSep			0.4
	Align			Block
	LabelType		Above
	LabelString		"Landscape Slide:"
	LabelFont
	  Family		Roman
	  Series		Medium
	  Size			Normal
	  Color			Blue
	EndFont
	HTMLLabel		NONE
End

Style Slide
	Obsoletedby		LandscapeSlide
End

Style PortraitSlide
	CopyStyle		LandscapeSlide
	LatexName		slide*
	LabelString		"Portrait Slide:"
End
Style Slide*
	ObsoletedBy		PortraitSlide
End

Style ListOfSlides
	Category		MainText
	KeepEmpty		1
	LatexType		Command
	LatexName		listofslides
	Margin			Dynamic
	ParIndent		MM
	TopSep			0.5
	BottomSep		0.5
	Align			Center
	LabelType		Static
	LabelString		"[List Of Slides]"
	LabelFont
	  Family		Roman
	  Series		Medium
	  Size			Normal
	  Color			Blue
	EndFont
	HTMLLabel		NONE
End

Style SlideContents
	CopyStyle		ListOfSlides
	LatexName		slidecontents
	LabelString		"[Slide Contents]"
End

Style ProgressContents
	CopyStyle		ListOfSlides
	LatexName		Slidecontents
	LabelString		"[Progress Contents]"
End