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-
-\section Examples with labeled parts: Basics
-
-\begininventory
-\counter \idx{|\pexcnt|}\endmc
-\macros \idx{|\pex~[]|}, \idx{|\a[]|}\endmc
-\parameters
-\idx{|labeltype|}& name of a key-value list& |alpha|\cr
-\idx{|labeloffset|\user} & \inc dimension& \textdim{1 em}\cr
-\idx{|labelwidth|\user} & \inc dimension& \textdim{.72 em}\cr
-\idx{|preambleoffset|\user} & \inc dimension& \textdim{1 em}\cr
-\idx{|interpartskip|\user} & \inc skip&
- 1\dimskip ex plus .2\dimskip ex minus .2\dimskip ex\cr
-\idx{|belowgpreambleskip|\user} & \inc skip&
- 1\dimskip ex plus .2\dimskip ex minus .2\dimskip ex\cr
-\idx{|samplelabel|}& token list& (pseudo-parameter)\cr
-\endinventory
-%
-Typical examples are given below, with the initial parameter
-settings.\medskip
-
-\framedisplay
-\pex
-\a This is the first example.
-\a This is the second example.
-\xe
-
-\pex~<Pre> Multipart examples often have a title or preamble of some
-kind.
-\a This is the first example.
-\a This is the second example.
-\xe
-\endframedisplay
-
-\codedisplay~
-\pex
-\a This is the first example.
-\a This is the second example.
-\xe
-
-\pex~ Multipart examples often have a title or preamble of some kind.
-\a This is the first example.
-\a This is the second example.
-\xe |endcodedisplay
-
-\noindent
-Just like |\ex|, |\pex| must be closed by |\xe|, can be
-modified by a tilde diacritic to suppress adding vertical space
-above the example, and accepts parameters. The macro \idx{|\a|},
-which introduces each labeled part, is defined only
-within \hbox{|\pex| \dots|\xe|}. It accepts certain parameters.
-Extra vertical skip (set by |interpartskip|) is inserted
-between the parts; and extra vertical skip (determined by
-|belowpreambleskip|) is inserted between
-the {\it preamble\/} and the first part. The preamble is the
-visible material, if any, that appears after the example number
-and before the first part.
-
-The horizontal dimensions are parameterized as pictured below,
-provided that the anchoring parameters have their initial values.
-The parameters |numoffset| and |textoffset| are used in both
-|\ex| and |\pex| constructions.
-The effects of changing the settings of the
-anchoring parameters (|labelanchor| and |textanchor|) will be
-considered in Section \getref{anchors}.
-
-\exdisplay
-\makeatletter
-\vrule height1.6em depth3.5em width0pt
-\psscalebox{1.5}{%
-\parindent=0pt
-\leavevmode
-\lingset{numoffset=4.5em,preambleoffset=4em,labeloffset=3em,
- textoffset=4em,labelwidth=.8em}
-\pnode(0,0){A}
-\lower5ex\vbox{\hsize=3.8in
-\psset{arrows=<->}
-\pex[exno=24]
-\a \pnode{E6}%
-This is an example.%
-\SpecialCoor
-\rput(A|E6){\pnode{E1}}
-\rput(E1){\pnode(\lingnumoffset,0){E2}}
-\rput(E6){\pnode(-\lingtextoffset,0){E5}}
-\rput(E5){\pnode(-\linglabelwidth,0){E4}}
-\rput(E4){\pnode(-\linglabeloffset,0){E3}}
-\psset{nodesep=0,labelsep=0}
-\pcline[offset=2.5ex](E1)(E2)
-\Aput{\strut\eighttt numoffset}
-\pcline[offset=2.5ex](E3)(E4)
-\Aput{\strut\eighttt labeloffset}
-\pcline[offset=2.5ex](E5)(E6)
-\Aput{\strut\eighttt textoffset}
-%\pcline[offset=-1.5ex,arrows=>-<,nodesep=-.65ex](E4)(E5)
-\pcline[offset=-1.5ex](E4)(E5)
-\Bput{\strut\eighttt labelwidth}
-\psset{offset=0,angle=90,linestyle=dotted,arrows=-}
-\XKV@for@n{1,2,3,4,5,6}\which{%
- \pcline(E\which)([nodesep=3ex]E\which)}
-\pcline([nodesep=1.5ex]E4)([nodesep=-2ex]E4)
-\pcline([nodesep=1.5ex]E5)([nodesep=-2ex]E5)
-\xe}}%
-\xe
-Adjustment for the width of the example number is automatic, but
-the width of the label slot is a parameter setting, not adjusted
-to the width of the particular label which appears in the label
-slot. The initial setting of |labelwidth| is the width of ``a.''
-at the point that the default setting is established. This does
-not automatically change if the font is changed, in a footnote
-for example. It can be set by the user explicitly by setting
-|labelwidth| to the desired dimension, or as an incremental
-change to its previous value (|labelwidth=!3pt|, for example,
-increases the width of the label slot by 3pt). It can also be
-set indirectly by giving a sample label. |labelwidth| is then
-set to the current width of that sample. \ExPex\ sets the
-default label width by |samplelabel=a.|.
-
-\ExPex\ comes with three label types predefined: |alpha|,
-|caps|, and |numeric|.
-
-\beginss
-\pex[labeltype=alpha]
-\a First part.
-\a Second part.
-\xe |midss
-\pex[labeltype=alpha]
-\a First part.
-\a Second part.
-\xe
-\endss
-
-\beginss
-\pex[labeltype=caps]
-\a First part.
-\a Second part.
-\xe |midss
-\pex[labeltype=caps]
-\a First part.
-\a Second part.
-\xe
-\endss
-
-\beginss
-\pex[labeltype=numeric]
-\a First part.
-\a Second part.
-\xe |midss
-\pex[labeltype=numeric]
-\a First part.
-\a Second part.
-\xe
-\endss
-
-Section \getref{advanced} will detail all the parameters relevant
-to the label types and how additional label types can be defined
-by the user.
-
-%--------------------------------------
-\subsection {\tt nopreamble}
-
-\begininventory
-\parametersdef*
-\idx{|nopreamble|}& boolean& (not relevant)& \hfil true\cr
-\endinventory
-%
-In order to properly format examples with parts, there are
-various reasons that |\pex| must be able to figure out whether
-or not there is a preamble. One reason is fairly obvious. If
-there is a preamble, every part introduced by |\a| must start on
-a new line, otherwise only parts after the first part start a new
-line. |\pex| tries to figure it out without help. If |\a|
-directly follows |\pex|(|~|)(|[|\dots|]|) and perhaps a following
-space, |\pex| knows there is no preamble and acts accordingly.
-There are a few other following tokens, considered later in this
-manual, that |\pex| also knows are not signals that there is a
-preamble. But |\pex|'s preamble detection abilities are
-primitive. The following, for example, will confuse |\pex|.
-
-\beginss
-\pex \it
-\a first
-\a second
-\xe|midss
-\pex \it
-\a first
-\a second
-\xe
-\endss
-The |\it| command is interpreted as a preamble.
-
-|\pex| needs some guidance in this case. It is provided by the
-parameter |nopreamble|.
-
-\beginss
-\pex[nopreamble=true] \it
-\a first
-\a second
-\xe|midss
-\pex[nopreamble=true] \it
-\a first
-\a second
-\xe
-\endss
-
-In fact, it is a little simpler than this. XKV parametrization
-allows one to stipulate a default value for each key that is
-defined. If the key is given to the parameter setting machinery
-with no value, then the key is set to the default value.
-|nopreamble| has the default value |true|. So the following is
-sufficient.
-
-\beginss
-\pex[nopreamble] \it
-\a first
-\a second
-\xe|midss
-\pex[nopreamble] \it
-\a first
-\a second
-\xe
-\endss
-
-The global setting of |nopreamble| is irrelevant to |\pex|, which
-always assumes there is a preamble unless it sees an immediately
-following |\a| or |\pex| or is told directly that there is no
-preamble. In the following, for example, the setting of
-|nopreamble| outside |\pex| has no effect.
-
-\beginss
-\lingset{nopreamble=true}
-\pex \it
-\a first
-\a second
-\xe|midss
-\lingset{nopreamble=true}
-\pex \it
-\a first
-\a second
-\xe
-\endss
-
-%\font\titlett=txtt at 13.3pt
-
-\subsection Stipulated labels
-
-\begininventory
-\parameters*
-|label|& token list& |{}|\cr
-\endinventory
-%
-|label| is recognized as a key only by the |\a| macro. % =«value»
-If |label=«value»| is passed to |\a|, that value is inserted as the
-label, ignoring automatic label generation.
-
-\beginss
-\pex[exno=47]
-\a[label=b]
-\a[label=d]
-\a[label=g]
-\xe|midss
-\pex[exno=47]
-\a[label=b]
-\a[label=d]
-\a[label=g]
-\xe
-\endss
-
-\noindent Besides |label|, the only other key that |\a|
-recognizes is |tag|. See Section \getref{named-reference}.