aimmath-commit Mailing List for AiM Assessment in Mathematics (Page 3)

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Update of /cvsroot/aimmath/AIM/WEB-INF/maple
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv17595/WEB-INF/maple

Added Files:
      Tag: aim-xml
	XML.mpl 
Log Message:
General XML-handling facilities

--- NEW FILE: XML.mpl ---
# Copyright (C) 2004 Neil Strickland
# Distributed without warranty under the GPL - see README for details

read("Package.mpl"):

Package("XML","
 This package defines a number of convenient methods for working with XML.  
"):

`Package/Dependencies` := []:

######################################################################

`Package/Assign`(
 `type/XML/Var`::type,
 "@type(x,`XML/Var`)@ is  @true@ if @x@ is of the form
  `XML/Var`@(something)@ or `XML/ValueVar`@(something)@
  or `XML/AttributeVar`@(something)@.",
  {specfunc(anything,`XML/Var`),
   specfunc(anything,`XML/ValueVar`),
   specfunc(anything,`XML/AttributeVar`)}
):

`Package/Assign`(
 `type/XML/ValueVar`::type,
 "@type(x,`XML/ValueVar`)@ is  @true@ if @x@ is of the form
  `XML/ValueVar`@(something)@.",
  {specfunc(anything,`XML/ValueVar`)}
):

`Package/Assign`(
 `type/XML/AttributeVar`::type,
 "@type(x,`XML/AttributeVar`)@ is  @true@ if @x@ is of the form
  `XML/AttributeVar`@(something)@.",
  {specfunc(anything,`XML/AttributeVar`)}
):

`Package/Assign`(
 `type/XML/PackedTemplate`::type,
 "A packed template is a particular kind of XML element, namely a 
  &lt;seq> element whose contents are just strings or XML variables.
  Any template (ie any XML element, possibly with variable elements)
  can be converted to a packed template by converting the elements
  to strings as far as possible.
 ",
 proc(x::anything)
  RETURN(evalb(
   type(x,`XML/Element`) and
   x['Type'] = "seq" and
   type(x['Contents'],list({string,`XML/Var`}))));
 end
):

######################################################################

######################################################################

`Package/Assign`(`XML/NamespaceTable`,
 "A table mapping three standard prefixes (the empty string,
  @xml@ and @xmlns@) to namespace URIs.
 ",
 table(["" = "", "xmlns" = "", "xml" = "http://www.w3.org/XML/1998/namespace"])
):

`Class/Declare`(`XML/Element`,
 "An object of type Element represents a XML element together with its attributes
  and contents.
 ",

 ['Constructor',
  "<p>
   If @head@ is a string, then it is used as the element type,
   and there are no attributes.
   </p><p>
   If @head@ is a list, then the first element is used as the 
   element type, and the remaining elements are used as attribute
   equations.
   </p><p>  
   Any arguments after the first are used as the contents of the element.  
   <ul>
    <li> if an argument is a string or a element object, it is used directly</li>
    <li> if an argument is a list, then the constructor is applied 
         recursively with the list entries as arguments
    </li>
   </ul>
   Additionally, if any attribute or content object is a set of the
   form @{x}@, it gets converted to @`XML/Var`(x)@.
   </p>
  ",
  proc(this,head::{string,list})
   local msg,qn,i;

   this['Attributes'] := table([]);
   this['NamespaceTable'] := eval(`XML/NamespaceTable`);

   if nargs = 1 then
    return();
   fi;

   if type(head,string) then
    qn := head;
   elif type(head,list) and
        nops(head) > 0 and
        type(head[1],string) then
    qn := head[1];
    this['SetAttributes',op(head[2..-1])];
   else
    msg :=
     sprintf("Head should be a string or a list whose first element is a string: %A",head);
    ERROR(msg);
   fi;

   i := searchtext(":",qn);
   if i > 0 then
    this['Prefix'] := substring(qn,1..i-1);
    this['Name']   := substring(qn,i+1..-1);
   else
    this['Prefix'] := "";
    this['Name']   := qn;
   fi;

   this['Contents'] :=
    map(`XML/NewElementAux`,[args[3..-1]],this['NamespaceTable']);

   RETURN();
  end
 ],

 ['Field','Type'::string,
  "The type of element.  For example, for an image element, this would be the 
   string &quot;img&quot;.  For a element like 
   @&lt;n:widget xmlns:n=&quot;http://www.gadgets.com/bits&quot;&gt;@,
   this field just contains the string &quot;widget&quot;.
  "
 ],

 ['Field','Prefix'::string,
  "For a element like 
   @&lt;xyz:widget xmlns:xyz=&quot;http://www.gadgets.com/bits&quot;&gt;@,
   this field just contains the string &quot;xyz&quot;.
  "
 ],

 ['Field','NamespaceTable'::table = eval(`XML/NamespaceTable`),
  "A table giving namespace URI's associated to various prefixes that 
   may be used in this element, its descendants, and associated 
   attributes.
  "
 ],

 ['Field','NamespaceTableInherited'::boolean=true,
  "For efficiency, the namespace table is often inherited from an 
   ancestor element.  In that case, this field should be set to @true@.
   This acts as a warning that we must copy the table before making
   changes to it.
  "
 ],

 ['Method','QName'::string,
  "",
  proc(this)
   local t,p;
   t := this['Type'];
   p := this['Prefix'];
   `if`(p="",t,cat(p,":",t));
  end
 ],

 ['Method','GetURI'::string,
  "Fetch the URI associated to a specified prefix, returning 
   @NULL@ if no URI is known.
  ",
  proc(this,prefix::string)
   local t;
   t := eval(this['NamespaceTable']);
   if assigned(t[prefix]) then
    return(t[prefix]);
   else
    return(NULL);
   fi;
  end
 ],

 ['Method','NamespaceURI'::string,
  "The URI describing the namespace for the name of this element",
  proc(this)
   local t,prefix;
   t := eval(this['NamespaceTable']);
   prefix := this['Prefix'];
   if assigned(t[prefix]) then
    return(t[prefix]);
   else
    return(NULL);
   fi;
  end
 ],

 ['Field','Attributes'::table,
  "The table of attributes of the element, indexed by pairs
   @(attribute prefix,attribute name)@.
  "
 ],

 ['Method','SetAttributes'::'void',
  "The arguments should be attribute equations; they are added 
   to the attributes of the element.  Qualified names can be
   given in the form @&quot;foo:bar&quot;@ or 
   @[&quot;foo&quot;,&quot;bar&quot;]@.  Attributes that are
   namespace declarations will be added to the @NamespaceTable@
   field in the obvious way.  Attributes may also be given as
   expressions of the form
   <p>
   @_XML_Attribute(_XML_AttrName(...),_XML_AttrValue(...))@,
   </p>
   as generated by the @XMLTools@ module.
  ",
  proc(this)
   local x,qn,v,a,msg,i;

   a := eval(this['Attributes']);

   for x in args[2..-1] do
    if type(x,`MapleXML/Attribute`) then
     qn := [op([1,2],x),op([1,1],x)];
     v  := op([2,1],x);
    else
     if type(x,equation) then
      qn := lhs(x);
      v  := rhs(x);
     else
      qn := x;
      v  := "true";
     fi;
     if type([qn],[string]) then
      i := searchtext(":",qn);
      if i > 0 then
       qn := [substring(qn,1..i-1),substring(qn,i+1..-1)];
      else
       qn := ["",qn];
      fi;
     fi;
    fi;

    if not(type([qn],[[string,string]])) then
     msg :=
      sprintf(
       __("LHS of attribute equation is not a string or pair of strings: %a"),
       x);
     ERROR(msg);
    fi;

    if v = NULL then
     a[op(qn)] := NULL;
     next;
    fi;

    if nops([v]) > 1 then
     msg := sprintf(__("RHS of attribute equation is a sequence: %a"),x);
     ERROR(msg);
    fi;

    if type(v,set) and nops(v) = 1 then
     v := `XML/ValueVar`(op(v));
    fi;

    if qn[1] = "xmlns" and type(v,string) then
     this['AddPrefix',qn[2],v];     
    fi;

    if type(v,{string,numeric,boolean,`XML/ValueVar`}) then
     a[op(qn)] := v;
    else
     msg := sprintf(__("Invalid attribute equation: %a"),x);
     ERROR(msg);
    fi;
   od;
   NULL;
  end
 ],

 ['Method','AddPrefix'::'void',
  "Adds a prefix and associated URI to the namespace table.  
   If the namespace table was inherited from an ancestor,
   make a new copy before modifying it.
  ",
  proc(this,prefix::string,uri::string)
   local t;
   t := eval(this['NamespaceTable']);
   if this['NamespaceTableInherited'] then
    t := copy(t);
    this['NamespaceTable'] := eval(t);
    this['NamespaceTableInherited'] := false;
   fi;
   t[prefix] := uri;
  end
 ],

 ['Method','ClearAttributes'::'void',
  "Remove all attributes of the element.  The namespace table 
   is not changed, which could in principle lead to 
   inconsistencies.
  ",
  proc(this) this['Attributes'] := table([]); NULL; end
 ],

 ['Field','Contents'::list,
  "The list of contents of the element.  These may be strings, numbers,
   boolean values, elements, XML variables or packed menus.
  "
 ],

 ['Method','AddContents'::'void',
  "Apply the function #`XML/NewElementAux`# to each of the arguments,
   and append the results to the @Contents@ field",
  proc(this)
   local newcontents;

   newcontents := map(`XML/NewElementAux`,[args[2..-1]]);

   this['Contents'] := [op(this['Contents']),
                        op(newcontents)];
   NULL;
  end
 ],

 ['Method','ClearContents'::'void',
  "Remove all contents of this element.",
  proc(this) this['Contents'] := []; end
 ],

 ['Method','ContentTree'::anything,
  "The arguments should be a sequence of positive integers.  For
   example, @element['ContentTree',6,2]@ is the second entry in the
   sixth entry of @element@.",  
  proc(this)
   local i,j,k,t,c,msg;

   t := this;
   for k from 2 to nargs do
    i := args[k];
    if not(type(k,posint)) then
     msg := __("Arguments to the ContentTree method must be positive integers");
     ERROR(msg);
    fi;
    if not(type(t,`XML/Element`)) then
     msg := __("ContentTree index out of bounds");
     ERROR(msg);
    fi;
    j := 0;
    c := t['Contents'];
    while ( j < nops(c) and i > 0 ) do 
     j := j+1;
     if type(c[j],`XML/Element`) then i := i-1; fi;
    od;
    if (i = 0) then
     t := eval(c[j]);
    else
     msg := __("ContentTree index out of bounds");
     ERROR(msg);
    fi;
   od;
   RETURN(eval(t));
  end
 ],

 ['Method','ToSeq',
  "",
  proc(this)
   local elementtype,s,attribtable,namix,nam,val,contents,separator,
         allstrings,a,x,msg,prefix,qn;

   s := "<",this['QName'];

   attribtable := eval(this['Attributes']);

   for namix in indices(attribtable) do
    prefix := namix[1];
    nam    := namix[2];
    qn := `if`(prefix="", nam, cat(prefix,":",nam));

    val := attribtable[op(namix)];

    # ignore attributes whose value is NULL
    if val = NULL then next; fi;

    if type(val,`XML/ValueVar`) then
     s := s,`XML/AttributeVar`(nam,op(val));
    elif val <> NULL then
     s := s," ",qn,"=",`XML/ValueEscape`(val);
    fi;
   od;

   if this['Contents'] = [] then
    s := s,"/>";
    return(`XML/Condense`(s));
   fi;

   s := s,">";

   contents := NULL;

   for x in this['Contents'] do
    if type(x,`XML/Element`) then
     contents := contents,x['ToSeq'];
    elif type(x,`XML/Var`) then
     contents := contents,x;
    elif type(x,{string,numeric,boolean}) then
     contents := contents,sprintf("%A",x);
    else
     msg := sprintf(__("Invalid contents in XML element: %a"),x);
     ERROR(msg);
    fi;
   od;

   s := s,contents,"</",this['QName'],">";

   RETURN(`XML/Condense`(s));
  end
 ],

 ['Method','Variables'::set(`XML/Var`),
  "Return the list of all XML variables that appear in this element.",
  proc(this)
   local v;
   v := {this['ToSeq']};
   v := select(type,v,`XML/Var`);

   RETURN(v);
  end
 ],

 ['Method','ToPack'::`XML/Element`,
  "Return the result of converting this element to a packed template.",
  proc(this)
   local s,t;

   s := this['ToSeq'];
   t := `new/XML/Element`("seq");
   t['Contents'] := [s];
   RETURN(eval(t));
  end
 ],

 ['Method','IsPacked'::boolean,
  "Return @true@ if this element is a packed template.",
  proc(this)
   evalb(
    this['Type'] = "seq" and
    type(this['Contents'],
         list({string,numeric,boolean,`XML/Var`})));
  end
 ],

 ['Method','IsFilled'::boolean,
  "Return @true@ if this is a &lt;seq> element whose contents are all
   strings, numbers or boolean values.
  ",
  proc(this)
   evalb(
    this['Type'] = "seq" and
    type(this['Contents'],
         list({string,numeric,boolean})));
  end
 ],

 ['Method','ToString'::`XML/String`,
  "Return a string of XML representing this element.",
  proc(this) `XML/ToString`(this['ToSeq']); end
 ],

 ['Method','Print'::'void',
  "Print a string of XML representing this element.",
  proc(this) `XML/Print`(this); end
 ]
):

### Auxiliary function used in the constructor

`Package/Assign`(
 `XML/NewElementAux`,
 "An auxiliary function used by the constructor #`new/XML/Element`#", 
 proc(x,p_::table)
  local msg,p;

  if nargs > 1 then
   p := eval(p_);
  else
   p := NULL;
  fi;

  if type([x],{[string],[numeric],[boolean]}) then
   RETURN(x);
  elif type([x],[specfunc(string,_XML_Text)]) then
   RETURN(op(1,x));
  elif type([x],[specfunc(string,_XML_Entity)]) then
   RETURN(cat("&",op(1,x),";"));
  elif type([x],[`XML/Element`]) then
   if x['Type'] = "seq" then
    RETURN(op(x['Contents']));
   else
    RETURN(eval(x));
   fi;
  elif type([x],[set]) and nops(x) = 1 then
   RETURN(`XML/Var`(op(x)));
  elif type([x],[list]) then
   RETURN(`new/XML/Element`(op(x)));
  elif type([x],[`MapleXML/Element`]) then
   RETURN(`XML/Objectify`(x,p));
  else
   msg := 
    sprintf("Invalid argument in XML/NewElementAux: %a",[x]);
   ERROR(msg);
  fi;
 end
):

######################################################################

`Package/Assign`(
 `XML/Condense`::exprseq(string),
 "Join together any consecutive sequences of strings in the arguments,
  and return the resulting sequence.  For example,
  <pre>
   @`XML/Condense`(\"abc\",\"def\",3,\"x\",\"y\",\"z\") =
      \"abc\",3,\"xyz\"
   @
  </pre>
 ",
 proc()
  local a,b,x,y;

  a := NULL;
  b := NULL;

  for x in args do
   if type(x,{boolean,numeric}) then
    y := sprintf("%A",x);
   else
    y := x;
   fi;

   if type(y,string) then
    b := b,y;
   else
    if b <> NULL then a := a,cat("",b); fi;
    b := NULL;
    a := a,y;
   fi;
  od;
  if b <> NULL then a := a,cat("",b); fi;

  RETURN(a);
 end
):

######################################################################

`Package/Assign`(
 `XML/ElementOpenStart`::string,
 "An auxiliary function for converting elements to strings.  Special
  behaviour for a few elements is stored in the remember table for 
  this function.",
 proc(elementtype::string)
  cat("<",elementtype);
 end
):

`Package/Assign`(
 `XML/ElementOpenEnd`::string,
 "An auxiliary function for converting elements to strings.  Special
  behaviour for a few elements is stored in the remember table for 
  this function.",
 proc(elementtype::string)
  cat(">");
 end
):

`Package/Assign`(
 `XML/ElementClose`::string,
 "An auxiliary function for converting elements to strings.  Special
  behaviour for a few elements is stored in the remember table for 
  this function.",
 proc(elementtype::string)
  cat("</",elementtype,">");
 end
):

# Adjust whitespace
`XML/ElementOpenEnd`("br") := " />\n":
`XML/ElementOpenEnd`("hr") := " />\n":
`XML/ElementOpenEnd`("p") := ">\n":
`XML/ElementClose`("p") := "\n</p>\n":
`XML/ElementOpenEnd`("div") := ">\n":
`XML/ElementClose`("div") := "\n</div>\n":

`XML/ElementOpenStart`("seq")        := "":
`XML/ElementOpenEnd`("seq")          := "":
`XML/ElementClose`("seq")            := "":

######################################################################

`Package/Assign`(
 `XML/ToString`,
 "Convert all arguments to strings, concatenate, and return the result.
  The arguments can be XML elements or primitive object (strings, numbers 
  or boolean values).  XML variables are also converted to strings, but
  this is primarily intended for developing and debugging templates.
 ",
 proc()
  local s,x;
  s := "";

  for x in args do
   if type(x,string) then
    s := s,x;
   elif type(x,{numeric,boolean}) then
    s := s,sprintf("%A",x);
   elif type(x,`XML/Element`) then
    s := s,`XML/ToString`(x['ToSeq']);
   elif type(x,`XML/ValueVar`) then
    s := s,sprintf("%a",{op(x)});
   elif type(x,`XML/AttributeVar`) then
    s := s,sprintf(" %a={%a}",op(1,x),op(2,x));
   elif type(x,`XML/Var`) then
    s :=
     s,
      "<font color='green'>",
      `XML/Escape/String`(sprintf("%A",{x})),
      "</font>";
   else
    s :=
     s,
      "<font color='aqua'>",
      `XML/Escape/String`(sprintf("%A",x)),
      "</font>";
   fi;
  od;

  RETURN(cat(s));
 end
):

######################################################################

`Package/Assign`(
 `XML/ToPack`::`XML/PackedTemplate`,
 "Convert the arguments to a packed template.  The arguments can be 
  XML elements or variables, or &lt;select> elements with indeterminate
  initial selection, or primitive types (strings, numbers or boolean
  values).
 ",
 proc()
  local pack,x,t;
  pack := "";

  for x in args do
   if type(x,{numeric,boolean}) then
    pack := pack,sprintf("%A",x);
   elif type(x,`XML/Element`) then
    pack := pack,op(x['ToPack']['Contents']);
   else
    pack := pack,x;
   fi;
  od;

  pack := `XML/Condense`(pack);

  t := `new/XML/Element`("seq");
  t['Contents'] := [pack];

  RETURN(eval(t));
 end
):

######################################################################

`Package/Assign`(
 `XML/Print`::'void',
 "Convert @x@ to a string using #`XML/ToString`# and print it.",
 proc(x)
  printf("%s\n\n",`XML/ToString`(x));
  NULL;
 end
):

######################################################################

`Package/Assign`(
 `XML/Subs`,
 "The last argument @x@ is expected to be a packed template with some
  variable elements.  The other arguments are equations like @n = v@.
  The return value is a copy of @x@ with all occurences of
  @`XML/Var`(n)@ replaced by @v@, and similarly for 
  @`XML/ValueVar`@ and @`XML/AttributeVar`@
 ",
 proc()
  local eqs,a,b,c,x,y,z,t,msg;

  if nargs = 0 then RETURN(NULL); fi;

  x := args[nargs];
  if not(type(x,`XML/PackedTemplate`)) then
   msg := __("Last argument is not a packed template.");
   ERROR(msg);
  fi;

  eqs := NULL;

  t := table([args[1..-2]]);

  y := map(`XML/SubsAux`,x['Contents'],t);
  y := [`XML/Condense`(op(y))];

  z := `new/XML/Element`("seq");
  z['Contents'] := y;
  RETURN(eval(z));
 end
):

`Package/Assign`(
 `XML/SubsAux`,
 "An auxiliary function used by #`XML/Subs`#",
 proc(u,v::table)
  local a;

  if type(u,`XML/Var`) and assigned(v[op(u)]) then
   v[op(u)];
  elif type(u,`XML/AttributeVar`) and assigned(v[op(2,u)]) then
   a := v[op(2,u)];
   if a = NULL then
    NULL;
   elif type([a],[{string,numeric}]) then
    cat(" ",op(1,u),"=",`XML/ValueEscape`(a));
   else
    u;
   fi;
  else
   u;
  fi;
 end
):

######################################################################

`Package/Assign`(
 `XML/Escape/String`::`XML/String`,
 "Return a copy of @s@ with all less-than signs, greater-than signs,
  ampersands and quotation marks replaced by the corresponding XML
  character entities (&amp;lt;, &amp;gt;, &amp;amp; and &amp;quot;).
  The result is suitable for use as XML text.
 ",
 proc(s::string)
  local b;

  b := convert(s,bytes);

  b := subs( 38 = (38, 97, 109, 112, 59),        # &amp;
             60 = (38, 108, 116, 59),            # &lt;
      62 = (38, 103, 116, 59),            # &gt;
      34 = (38, 113, 117, 111, 116, 59),  # &quot;
      b);

  convert(b,bytes);
 end
):

`Package/Assign`(
 `XML/Escape`::`XML/String`,
 "This is the same as #`XML/Escape/String`# except that it also 
  accepts a variable number of arguments, converts non-strings to
  strings, and concatenates the results.
 ",
 proc()
  local x,html;

  html := "";
  for x in args do
   if type(x,string) then
    html := html,x;
   else
    html := html,sprintf("%A",x);
   fi;
  od;

  RETURN(`XML/Escape/String`(cat(html)));
 end
):

`Package/Assign`(
 `XML/ValueEscape/String`::`XML/String`,
 "Return a copy of @s@ with ampersands and quotation marks replaced
  by the corresponding XML character entities
  (&amp;amp; and &amp;quot;), wrapped in quotation marks.
  The result is suitable for use as an XML attribute value.
 ",
 proc(s::string)
  local b;

  b := convert(s,bytes);

  b := subs( 38 = (38, 97, 109, 112, 59),        # &amp;
             60 = (38, 108, 116, 59),            # &lt;
      62 = (38, 103, 116, 59),            # &gt;
      34 = (38, 113, 117, 111, 116, 59),  # &quot;
      b);

  convert([34,op(b),34],bytes);
 end
):

`Package/Assign`(
 `XML/ValueEscape`::`XML/String`,
 "This is the same as #`XML/ValueEscape/String`# except that it also 
  converts non-strings to strings.  
 ",
 proc(x)
  local s,b;

  if nargs = 0 then RETURN(NULL); fi;

  if type(x,{numeric,boolean}) then
   RETURN(sprintf("\"%A\"",x));
  fi;

  if type(x,string) then
   s := x;
  else
   # This should not happen in a working application.  The
   # specified behaviour is designed for debugging only.
   s := sprintf("%A",x);
  fi;

  RETURN(`XML/ValueEscape/String`(s));
 end
):

######################################################################

`Package/Assign`(
 `type/MapleXML/Element`,
 "",
 proc(x)
  evalb( 
   type(x,function) and
   op(0,x) = '_XML_Element' and
   nops(x) > 0 and
   type(op(1,x),`MapleXML/ElementType`)
  );
 end
):

`Package/Assign`(
 `type/MapleXML/ElementType`,
 "",
 proc(x)
  evalb( 
   type(x,function) and
   op(0,x) = '_XML_ElementType' and
   type([op(x)],[string$3])
  );
 end
):

`Package/Assign`(
 `type/MapleXML/Attribute`,
 "",
 proc(x)
  evalb( 
   type(x,function) and
   op(0,x) = '_XML_Attribute' and
   type([op(x)],[`MapleXML/AttrName`,`MapleXML/AttrValue`])
  );
 end 
):

`Package/Assign`(
 `type/MapleXML/AttrName`,
 "",
 proc(x)
  evalb( 
   type(x,function) and
   op(0,x) = '_XML_AttrName' and
   type([op(x)],[string$3])
  );
 end 
):

`Package/Assign`(
 `type/MapleXML/AttrValue`,
 "",
 proc(x)
  evalb( 
   type(x,function) and
   op(0,x) = '_XML_AttrValue' and
   type([op(x)],[string])
  );
 end 
):

`Package/Assign`(
 `type/MapleXML/Text`,
 "",
 proc(x)
  evalb( 
   type(x,function) and
   op(0,x) = '_XML_Text' and
   type([op(x)],[string])
  );
 end 
):

`Package/Assign`(
 `XML/Objectify`::`XML/Element`,
 "",
 proc(e::`MapleXML/Element`,p_::table)
  local t,x,p,n;

  t := op(1,e);
  x := `new/XML/Element`();
  x['Type']         := op(1,t);
  x['Prefix']       := op(2,t);
  if nargs > 1 then
   x['NamespaceTable'] := eval(p);
   x['NamespaceTableInherited'] := true;
  elif op(2,t) <> "" or op(3,t) <> "" then
   n := copy(`XML/NamespaceTable`);
   n[op(2,t)] := op(3,t);
  fi;  
  x['SetAttributes',op(op(2,e))];

  x['Contents'] := 
   map(`XML/NewElementAux`,op(3,e));

  RETURN(eval(x));
 end
):

######################################################################

EndPackage():

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