<alt> (alternation) identifies an alternation or a set of choices among elements or passages.
Attributes:
targets specifies the SGML identifiers of the alternative elements or passages.
Datatype: IDREFS
Values: Each value specified must be the same as that specified as value for an ID attribute for some other element in the current SGML document.
Default: #REQUIRED
mode states whether the alternations gathered in this collection are exclusive or inclusive.
Datatype: (excl|incl)
Legal values:
excl indicates that the alternation is exclusive, i.e. that at most one of the alternatives occurs.
incl indicates that the alternation is not exclusive, i.e. that one or more of the alternatives occur.
Default: %INHERITED
weights If mode=excl , each weight states the probability that the corresponding alternative occurs. If mode=incl each weight states the probability that the corresponding alternative occurs given that at least one of the other alternatives occurs.
Datatype: NUMBERS
Values: a list of numbers, in the range from 0 to 1 if wScale=real , and in the range from 0 to 100 if wScale=perc .
Default: #IMPLIED
Note

If mode=excl then sum of weights must be 1 (or 100%). If mode=incl , then sum of weights must be in the range from 0 to the number of alternants (or 0 to 100% times the number of alternants).

wScale indicates the scale used to express the value of the weights attribute value.
Datatype: (perc|real)
Legal values:
perc indicates that the weights are expressed as percentages.
real indicates that the weights are expressed as values between 0 and 1.
Default: %INHERITED
targOrder specifies whether the targets are ordered.
Datatype: (Y|N)
Legal values:
Y indicates that the targets are ordered.
N indicates that the targets are not ordered.
Default: N
Note

This attribute is one of those assigned to elements of the pointer class. It is specified here so as to assign it a default value.

Example 
<alt mode="excl" targType='u u' targets='we.fun we.sun' weights='50 50'>
Note

Tagsetadditional tag set for
ClasscomplexVal, metadata, pointer [and indirectly also:] featureVal, globincl
Filenameteilink2.dtd
Content: empty
ParentsaltGrp f fs if vDefault vRange
Children[none]
Declaration
<!ELEMENT alt           - O  EMPTY                              >
<!ATTLIST alt                %a.global
          type               CDATA               #IMPLIED
          resp               CDATA               #IMPLIED
          crdate             CDATA               #IMPLIED
          targType           NAMES               #IMPLIED
          evaluate           (all | one | none)  #IMPLIED
          targets            IDREFS              #REQUIRED
          mode               (excl | incl)       %INHERITED
                                                  
          weights            NUMBERS             #IMPLIED
          wScale             (perc | real)       %INHERITED
                                                  
          targOrder          (Y | N)             N              >
See 14.8

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