Module:
  @QName:
    Util:ManakaiNode
  @FullName:
    @@lang: en
    @@@:
      Manakai Generic Node Implementation
  @Namespace:
    http://suika.fam.cx/~wakaba/archive/2005/manakai/Util/ManakaiNode#
  
  @Description:
    @@lang:en
    @@@:
      The <Module::Util:ManakaiNode> module provides a basic 
      implementation for glaph (perhaps tree) structures. 

  @Author:
    @@FullName: Wakaba
    @@Mail: w@suika.fam.cx
  @License:
     license:Perl+MPL
  @Date:
    @@@:
      $Date: 2005/09/09 04:26:08 $
    @@ContentType:
      dis:Date.RCS
  
  @Require:
    @@Module:
      @@@Name: DISPerl
      @@@QName: 
        DISlib:DISPerl
      @@@WithFor:
        ManakaiDOM:all
    @@Module:
      @@@Name: ManakaiNode
      @@@WithFor:
        ManakaiDOM:Perl

  @DefaultFor:
    ManakaiDOM:Perl

Namespace:
  @DIS:
    http://suika.fam.cx/~wakaba/archive/2005/manakai/Util/DIS#
  @dis:
    http://suika.fam.cx/~wakaba/archive/2004/8/18/lang#dis--
  @dis2pm:
    http://suika.fam.cx/~wakaba/archive/2004/11/8/dis2pm#
  @DISlib:
    http://suika.fam.cx/~wakaba/archive/2004/dis/
  @doc:
    http://suika.fam.cx/~wakaba/archive/2005/7/tutorial#
  @lang:
    http://suika.fam.cx/~wakaba/archive/2004/8/18/lang#
  @license:
    http://suika.fam.cx/~wakaba/archive/2004/8/18/license#
  @ManakaiDOM:
    http://suika.fam.cx/~wakaba/archive/2004/8/18/manakai-dom#
  @mn:
    http://suika.fam.cx/~wakaba/archive/2005/manakai/Util/ManakaiNode#
  @owl:
    http://www.w3.org/2002/07/owl#
  @Perl:
    http://suika.fam.cx/~wakaba/archive/2004/8/18/lang#Perl--
  @rdf:
    http://www.w3.org/1999/02/22-rdf-syntax-ns#
  @rdfs:
    http://www.w3.org/2000/01/rdf-schema#
  @TreeCore:\
  @Util:
    http://suika.fam.cx/~wakaba/archive/2005/manakai/Util/

ResourceDef:
  @QName:
    Util:
  @rdf:type:
    dis:ModuleGroup
  @FullName:
    @@lang:en
    @@@:
      The manakai support modules
  @AppName:
    @@@:
      Message::Util::IF::
    @@ForCheck:
      ManakaiDOM:ForIF !DIS|ForEmpty
  @AppName:
    @@@:
      Message::Util::IF::
    @@ForCheck:
      ManakaiDOM:ForIF =DIS|ForEmpty
  @AppName:
    @@@:
      Message::Util::IFLatest::
    @@ForCheck:
      ManakaiDOM:ForIF DIS|ForEmpty
  @AppName:
    Message::Util::

ForDef:
  @QName: DIS|ForEmpty
  @enDesc:
    For any version
  @ISA:
    ManakaiDOM:Perl

## -- Internal node object

ClassDef:
  @resourceFor: ForFull
  @resourceFor: ForCompact
  @resourceFor:
    ManakaiDOM:ForIF
  
  @QName:
    @@@: NodeStem
    @@ForCheck: 
      ManakaiDOM:ForIF

  @QName: 
    @@@:
      ManakaiDOM:ManakaiDOMNodeObject
    @@ForCheck: ForFull

  @QName:
    @@@: ManakaiNodeStem
    @@ForCheck: ForCompact

  @Implement:
    @@@: NodeStem
    @@ForCheck: ForFull

  @Implement:
    @@@: NodeStem
    @@ForCheck: ForCompact

  @Description:
    @@lang:en
    @@@:
      Internal (actual) node objects that is accessed via 
      <Class::ManakaiDOM:ManakaiDOMNodeReference> objects referring it. 
  @ImplNote:
    @@lang:en
    @@@:
      No public interface should be defined for any class inheriting 
      this class - applications should access to nodes only via 
      <Class::ManakaiDOM:ManakaiDOMNodeReference> objects. 
  @ImplNote:
    @@ForCheck: ManakaiDOM|ForClass
    @@lang:en
    @@@:
      A <Class::> object is a blessed hash 
      reference.  Each hash key and value pair is called as a 
      <DFN::property>.  Currently, several core properties  
      are defined as listed below.  Applications of this class, 
      such as <Class::DOMCore:ManakaiDOMNode::ManakaiDOM:all>,
      defines additional properties for their own purpose and scope. 
      \
      {doc:fig:: <doc:caption::Core node properties>

         {doc:figBody::
         \
         - <CODE::TreeCore:nodeID>::: The global-unique identifier for 
                                      this node object. 
         \
         - <CODE::TreeCore:treeID>::: The global-unique identifier for the 
                                      tree containing this node object. 
         \
         - <CODE::TreeCore:rc>::: The number that denotes how many reference 
                                  to this node there are. 
         \
         - <CODE::TreeCore:origin>::: An array reference, containing 
                                  hash key names of <DFN::origin> 
                                  properties for this node. 
         \
         - <CODE::TreeCore:subnode0>::: An array reference, containing 
                                  hash key names of <DFN::subnode> 
                                  properties for this node. 
         \
         - <CODE::TreeCore:subnode>::: An array reference, containing 
                                hash key names of <DFN::subnode> list 
                                properties for this node. 
         \
         - <CODE::TreeCore:subnode2>::: An array reference, containing 
                    hash key names of <DFN::subnode> (two steps) list
                    properties for this node. 
         \
         - <CODE::TreeCore:irefnode>::: An array reference, containing 
                    hash key names of <DFN::irefnode> 
                    properties for this node. 
         \
         - <CODE::TreeCore:anydata>::: An array reference, containing 
                    hash key names of <DFN::anydata> list 
                    properties for this node. 
         \
         - <CODE::TreeCore:anydata2>::: An array reference, containing 
                    hash key names of <DFN::anydata> (two steps) list properties 
                    for this node. 
         }
       }

  @IntMethod:
    @@Name: new
    @@Description:
      @@@lang:en
      @@@@: 
        Constructs a new instance of 
        <Class::ManakaiDOM:ManakaiDOMNodeObject> and returns it.
    @@Return:
      @@@Type: NodeStem
      @@@Description:
        @@@@lang:en
        @@@@@: 
          The newly created <Class::ManakaiDOM:ManakaiDOMNodeObject> instance.
      @@@PerlDef: 
          $r = bless {
            <Q::TreeCore:origin> => [],
            <Q::TreeCore:subnode0> => [],
            <Q::TreeCore:subnode> => [],
            <Q::TreeCore:subnode2> => [],
            <Q::TreeCore:irefnode> => [],
            <Q::TreeCore:anydata> => [],
            <Q::TreeCore:anydata2> => [],
            <Q::TreeCore:rc> => 0,
            <Q::TreeCore:treeID> => <Code::ManakaiDOM:generateUniqueID>,
            <Q::TreeCore:nodeID> => <Code::ManakaiDOM:generateUniqueID>,
          }, ref $self || $self;

  @IntMethod:
    @@Name: newReference
    @@Description:
      @@@lang:en
      @@@@:
        Creates a new reference to this node and returns it.
    @@DISCore:isDeprecated:
      @@@@:1
      @@@DISCore:alt: getNewReference
    @@ForCheck: ForFull
    @@Param:
      @@@Name: class
      @@@Type:
        Perl:package-name::ManakaiDOM:all
      @@@Description:
        @@@@lang:en
        @@@@@:
          A Perl class package name with which the newly created 
          reference is blessed.  The <P::class> class must be a 
          subclass of <Class::ManakaiDOM:ManakaiDOM:ManakaiDOMNodeReference>.
    @@Return:
      @@@Type: 
        ManakaiDOM:ManakaiDOMNodeReference
      @@@Description:
        @@@@lang:en
        @@@@@:
          The newly created node reference.
      @@@PerlDef:
          $r = bless {
            <Q::TreeCore:node> => $self,
          }, ref $class ? ref $class : defined $class ? $class :
             <ClassName::ManakaiDOM:ManakaiDOMNodeReference>;
          $self->{<Q::TreeCore:rc>}++;

  @ResourceDef:
    @@QName: getNewReference
    @@rdf:type:
      dis2pm:BlockCode
    @@ForCheck: ForFull
    @@Description:
      @@@lang:en
      @@@@:
        Creates a new node reference object. 
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $object
      @@@Type: NodeStem
      @@@In:1
      @@@enDesc:
        A node object for which a reference is created.
      @@@DISPerl:paramStyle: var
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $ref
      @@@Type: NodeRef
      @@@Out:1
      @@@enDesc:
        A node reference for <P::$object>.  It may or may not 
        be same as <P::$object>.
      @@@DISPerl:paramStyle: var
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $class
      @@@Type:
        Perl:package-name::ManakaiDOM:all
      @@@enDesc:
        A package name with which <P::$ref> is blessed. 
      @@@In:1
      @@@DISPerl:paramStyle: any
    @@PerlDef:
      $object->{<Q::TreeCore:rc>}++;
      $ref = bless {
        <Q::TreeCore:node> => $object,
      }, $class;

  @ResourceDef:
    @@QName: getWeakReference
    @@rdf:type:
      dis2pm:BlockCode
    @@ForCheck: ForFull
    @@Description:
      @@@lang:en
      @@@@:
        Creates a new weak node reference object. 
        \
        The weak node reference is actually a node reference
        except that this code fragment does not increment
        the reference count of the object.  When all non-weak 
        references to the object are destructed, then
        the object is destructed and any operation via 
        weak references will lead unexpected result.
        \
        {NOTE:: It is intended that internal code creates a weak reference
                so that it gets access to public interface. 
        \
        }
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $object
      @@@Type: NodeStem
      @@@In:1
      @@@enDesc:
        A node object for which a reference is created.
      @@@DISPerl:paramStyle: var
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $ref
      @@@Type: NodeRef
      @@@Out:1
      @@@enDesc:
        A node reference for <P::$object>.  It may or may not 
        be same as <P::$object>.
      @@@DISPerl:paramStyle: var
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $class
      @@@Type:
        Perl:package-name::ManakaiDOM:all
      @@@enDesc:
        A package name with which <P::$ref> is blessed. 
      @@@In:1
      @@@DISPerl:paramStyle: any
    @@PerlDef:
      $ref = bless {
        <Q::TreeCore:node> => $object,
        <Q::TreeCore:isWeak> => true,
      }, $class;

  @ResourceDef:
    @@QName: getWeakRef
    @@rdf:type:
      dis2pm:InlineCode
    @@ForCheck: ForFull
    @@Description:
      @@@lang:en
      @@@@:
        Creates a new weak node reference object. 
        \
        The weak node reference is actually a node reference
        except that this code fragment does not increment
        the reference count of the object.  When all non-weak 
        references to the object are destructed, then
        the object is destructed and any operation via 
        weak references will lead unexpected result.
        \
        {NOTE:: It is intended that internal code creates a weak reference
                so that it gets access to public interface. 
        \
        }
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $object
      @@@Type: NodeStem
      @@@In:1
      @@@enDesc:
        A node object for which a reference is created.
      @@@DISPerl:paramStyle: var
    @@ResourceDef:
      @@@rdf:type:
        DISPerl:CodeParameter
      @@@Name: $class
      @@@Type:
        Perl:package-name::ManakaiDOM:all
      @@@enDesc:
        A package name with which <P::$ref> is blessed. 
      @@@In:1
      @@@DISPerl:paramStyle: any
    @@PerlDef:
      (bless {
        <Q::TreeCore:node> => $object,
        <Q::TreeCore:isWeak> => true,
      }, $class)

  @IntMethod:
    @@Name: isExternallyReferred
    @@Description:
      @@@lang:en
      @@@@:
        Checks whether the tree containing this node has been referred 
        from the outside of the tree or not. 
    @@Return:
      @@@Type: 
        DISPerl:Boolean::ManakaiDOM:all
      @@@InCase:
        @@@@Value: true
        @@@@Type:
          DISPerl:Boolean::ManakaiDOM:all
        @@@@Description:
          @@@@@lang:en
          @@@@@@: 
            There is one or more nodes in the tree that has been 
            referred via <Class::ManakaiDOM:ManakaiDOMNodeReference> objects.
      @@@InCase:
        @@@@Value: false
        @@@@Type:
          DISPerl:Boolean::ManakaiDOM:all
        @@@@Description:
          @@@@@lang:en
          @@@@@@: No external reference found.
      @@@PerlDef:
        @@@@ForCheck: ForFull
        @@@@@:
          if ($self->{<Q::TreeCore:rc>}) {
            $r = true;
          } else {
            my @node = ($self);
            my %checked;
            NODES: while (defined (my $node = shift @node)) {
              next unless UNIVERSAL::isa ($node,
                          <ClassName::ManakaiDOM:ManakaiDOMNodeObject>);
              if ($node->{<Q::TreeCore:rc>}) {
                $r = true;
                last NODES;
              } elsif ($checked{$node->{<Q::TreeCore:nodeID>}}) {
                next NODES;
              }
              my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, values %$p;
                }
              }
              for my $p (@{$node->{<Q::TreeCore:origin>}}) {
                unshift @node, $node->{$p} if $node->{$p};
                ## NOTE: Puts the top of the list,
                ##       since upper-level nodes are expected to be referred
                ##       more than lower-levels.
              }
              for my $p (@{$node->{<Q::TreeCore:subnode0>}}) {
                push @node, $node->{$p} if $node->{$p};
              }
              $checked{$node->{<Q::TreeCore:nodeID>}} = 1;
            }
          }
      @@@PerlDef:
        @@@@ForCheck: ForCompact
        @@@@@:
          if ($self->{<Q::TreeCore:rc>}) {
            $r = true;
          } else {
            my @node = ($self);
            my %checked;
            NODES: while (defined (my $node = shift @node)) {
              next unless ref $node;
              if ($node->{<Q::TreeCore:rc>}) {
                $r = true;
                last NODES;
              } elsif ($checked{$node->{<Q::TreeCore:nodeID>}}) {
                next NODES;
              }
              my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, values %$p;
                }
              }
              for my $p (@{$node->{<Q::TreeCore:origin>}}) {
                unshift @node, $node->{$p} if $node->{$p};
                ## NOTE: Puts the top of the list,
                ##       since upper-level nodes are expected to be referred
                ##       more than lower-levels.
              }
              for my $p (@{$node->{<Q::TreeCore:subnode0>}}) {
                push @node, $node->{$p} if $node->{$p};
              }
              $checked{$node->{<Q::TreeCore:nodeID>}} = 1;
            }
          }

  @IntMethod:
    @@Name: destroy
    @@Description:
      @@@lang:en
      @@@@:
        Destructs the tree containing this node. 
    @@Return:
      @@@PerlDef:
        @@@@ForCheck: ForFull
        @@@@@:
        my @node = ($self);
        NODES: while (defined (my $node = shift @node)) {
              my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, grep {UNIVERSAL::isa ($_,
                                    <ClassName::ManakaiDOM:ManakaiDOMNodeObject>)
                                    and defined $_->{<Q::TreeCore:nodeID>}} @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, grep {UNIVERSAL::isa ($_,
                                    <ClassName::ManakaiDOM:ManakaiDOMNodeObject>)
                                    and defined $_->{<Q::TreeCore:nodeID>}}
                               values %$p;
                }
              }
              for my $p (@{$node->{<Q::TreeCore:origin>}},
           \             @{$node->{<Q::TreeCore:subnode0>}}) {
                push @node, $node->{$p}
                  if defined $node->{$p} and
                     defined $node->{$p}->{<Q::TreeCore:nodeID>};
              }
          %$node = ();
        }
      @@@PerlDef:
        @@@@ForCheck: ForCompact
        @@@@@:
        my @node = ($self);
        NODES: while (defined (my $node = shift @node)) {
          next unless ref $node and defined $node->{<Q::TreeCore:nodeID>};
          my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, values %$p;
                }
              }
              for my $p (@{$node->{<Q::TreeCore:origin>}},
           \             @{$node->{<Q::TreeCore:subnode0>}}) {
                push @node, $node->{$p};
              }
          %$node = ();
        }
    @@ImplNote:
      @@@lang:en
      @@@@:
        This method is different from Perl <Perl::DESTROY> special 
        purpose method.
        \
        An <QUOTE::uninitialized> warning in this method might mean 
        some method puts an <Perl::undef> into a list of nodes. 

  @IntMethod:
    @@Name: importTree
    @@Description:
      @@@lang:en
      @@@@:
        Changes the tree identifier of the nodes belong to another tree 
        to be same as this node's tree identifier. 
    @@Param:
      @@@Name: node
      @@@Type: 
        ManakaiDOM:ManakaiDOMNodeObject
      @@@Description:
        @@@@lang:en
        @@@@@:
          Any node from the tree to change its identifier. 
    @@Return:
      @@@PerlDef:
        @@@@ForCheck: ForFull
        @@@@@:
        unless ($node->{<Q::TreeCore:treeID>} eq
                $self->{<Q::TreeCore:treeID>}) {
          my @node = ($node);
          NODES: while (defined (my $node = shift @node)) {
            next unless UNIVERSAL::isa ($node,
                        <ClassName::ManakaiDOM:ManakaiDOMNodeObject>);
              my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, grep {UNIVERSAL::isa ($_,
                                    <ClassName::ManakaiDOM:ManakaiDOMNodeObject>)
                                    and $_->{<Q::TreeCore:treeID>} ne
                                    $self->{<Q::TreeCore:treeID>}} @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, grep {UNIVERSAL::isa ($_,
                                    <ClassName::ManakaiDOM:ManakaiDOMNodeObject>)
                                    and $_->{<Q::TreeCore:treeID>} ne
                                    $self->{<Q::TreeCore:treeID>}}
                              values %$p;
                }
              }
            for my $p (@{$node->{<Q::TreeCore:origin>}},
           \           @{$node->{<Q::TreeCore:subnode0>}}) {
              push @node, $node->{$p}
                if defined $node->{$p} and
                   $node->{$p}->{<Q::TreeCore:treeID>} ne
                   $self->{<Q::TreeCore:treeID>};
            }
            $node->{<Q::TreeCore:treeID>} = $self->{<Q::TreeCore:treeID>};
          }
        }
      @@@PerlDef:
        @@@@ForCheck: ForCompact
        @@@@@:
          my @node = ($node);
          NODES: while (defined (my $node = shift @node)) {
            next unless ref $node;
            next if $node->{<Q::TreeCore:treeID>} eq
                    $self->{<Q::TreeCore:treeID>};
            my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, values %$p;
                }
              }
            for my $p (@{$node->{<Q::TreeCore:origin>}},
           \           @{$node->{<Q::TreeCore:subnode0>}}) {
              push @node, $node->{$p};
            }
            $node->{<Q::TreeCore:treeID>} = $self->{<Q::TreeCore:treeID>};
          }

  @IntMethod:
    @@Name: changeTreeID
    @@Description:
      @@@lang:en
      @@@@:
        Changes tree identifier of all nodes traversable from this node. 
    @@Param:
      @@@Name: treeID
      @@@Type: 
        DISPerl:String::ManakaiDOM:all
      @@@Description:
        @@@@lang:en
        @@@@@:
          The new tree identifier. 
    @@Return:
      @@@PerlDef:
        @@@@ForCheck: ForFull
        @@@@@:
        unless ($self->{<Q::TreeCore:treeID>} eq $treeID) {
          my @node = ($self);
          NODES: while (defined (my $node = shift @node)) {
            next unless UNIVERSAL::isa ($node,
                        <ClassName::ManakaiDOM:ManakaiDOMNodeObject>);
              my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, grep {UNIVERSAL::isa ($_,
                                    <ClassName::ManakaiDOM:ManakaiDOMNodeObject>)
                                    and
                                    $_->{<Q::TreeCore:treeID>} ne $treeID} @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, grep {UNIVERSAL::isa ($_,
                                    <ClassName::ManakaiDOM:ManakaiDOMNodeObject>)
                                    and $_->{<Q::TreeCore:treeID>} ne $treeID}
                              values %$p;
                }
              }
            for my $p (@{$node->{<Q::TreeCore:origin>}},
       \               @{$node->{<Q::TreeCore:subnode0>}}) {
              push @node, $node->{$p}
                if defined $node->{$p} and
                   $node->{$p}->{<Q::TreeCore:treeID>} ne $treeID;
            }
            $node->{<Q::TreeCore:treeID>} = $treeID;
          }
        }
      @@@PerlDef:
        @@@@ForCheck: ForCompact
        @@@@@:
          my @node = ($self);
          NODES: while (defined (my $node = shift @node)) {
            next unless ref $node;
            next if $node->{<Q::TreeCore:treeID>} eq $treeID;
              my @n;
              for my $p (@{$node->{<Q::TreeCore:subnode2>}}) {
                if (ref $node->{$p} eq 'ARRAY') {
                  push @n, @{$node->{$p}};
                } elsif (ref $node->{$p} eq 'HASH') {
                  push @n, values %{$node->{$p}};
                }
              }
              for my $p (@n,
                         map {$node->{$_}} @{$node->{<Q::TreeCore:subnode>}}) {
                if (ref $p eq 'ARRAY') {
                  push @node, @$p;
                } elsif (ref $p eq 'HASH') {
                  push @node, values %$p;
                }
              }
            for my $p (@{$node->{<Q::TreeCore:origin>}},
       \               @{$node->{<Q::TreeCore:subnode0>}}) {
              push @node, $node->{$p};
            }
            $node->{<Q::TreeCore:treeID>} = $treeID;
          }

  @IntMethod:
    @@Name: isSameNode
    @@Description:
      @@@lang:en
      @@@@:
        Returns whether a node is the same as this node or not. 
        \
        {NOTE:: The sameness is different from the equality; 
                two nodes are same iff they are same hash reference. 
        \
        }
    @@Operator:
      @@@ContentType:
        lang:Perl
      @@@@: eq
    @@Param:
      @@@Name: node
      @@@Type: NodeStem
      @@@Description:
        @@@@lang:en
        @@@@@:
          A node to compare with. 
    @@Return:
      @@@Type: 
        DISPerl:Boolean::ManakaiDOM:all
      @@@Description:
        @@@@lang:en
        @@@@@: Whether the two nodes are same or not.
      @@@PerlDef:
        @@@@ForCheck: ForFull
        @@@@@:
          if (ref $node and
              UNIVERSAL::isa ($node,
                              <ClassName::ManakaiDOM:ManakaiDOMNodeObject>) and
              $node->{<Q::TreeCore:nodeID>} eq $self->{<Q::TreeCore:nodeID>}) {
            $r = true;
          }
      @@@PerlDef:
        @@@@ForCheck: ForCompact
        @@@@@:
          if (ref $node and
              UNIVERSAL::isa ($node, <ClassName::NodeStem>) and
              $node->{<Q::TreeCore:nodeID>} eq $self->{<Q::TreeCore:nodeID>}) {
            $r = true;
          }
  @IntMethod:
    @@Name: orphanate
    @@Description:
      @@@lang:en
      @@@@:
        Notifies that this node (and its neibors if any) is no longer 
        part of the main tree.  If the new tree containing this node 
        has been referred yet, then the tree is preserved except its 
        tree identifier has changed.  Otherwise, i.e. the tree is 
        useless any more, then it is destructed. 
        \
        {NOTE:: Interaction on deleting a relationship from multiply 
                organized <QUOTE::trees> (such as DOM tree and 
                styled displaying tree) is less studied.  This 
                method might be modified or addition of another method(s) 
                might be required when style sheet, XBL, or other 
                technologies has been implemented.
        \
        }
    @@Return:
      @@@PerlDef:
        if ($self-><M::NodeStem.isExternallyReferred>) {
          $self-><M::NodeStem.changeTreeID>
                       (<Code::ManakaiDOM:generateUniqueID>);
        } else {
          $self-><M::NodeStem.destroy>;
        }
##NodeStem

## -- Public node object

ClassDef:
  @resourceFor: ForFull
  @resourceFor: ForCompact
  @resourceFor: 
    ManakaiDOM:ForIF

  @QName:
    @@@: NodeRef
    @@ForCheck:
      ManakaiDOM:ForIF

  @QName: 
    @@@:
      ManakaiDOM:ManakaiDOMNodeReference
    @@ForCheck: ForFull

  @Implement:
    @@@: NodeRef
    @@ForCheck: ForFull

  @QName:
    @@@: ManakaiNodeRef
    @@ForCheck: ForCompact

  @Implement:
    @@@: NodeRef
    @@ForCheck: ForCompact

  @Description:
    @@lang:en
    @@@:
      References to the node object corresponding to it.  From 
      applications' view, any node object is hidden and 
      <Class::ManakaiDOM:ManakaiDOMNodeReference> seems as if 
      the node itself. 
  @ImplNote:
    @@lang:en
    @@@:
      {P:: A <Class::ManakaiDOM:ManakaiDOMNodeReference> is a blessed hash 
      reference; currently there is a hash key defined:
        \
        - <CODE::TreeCore:node>::: A node object 
             (<Class::ManakaiDOM:ManakaiDOMNodeObject>) to which 
             this is referring. 
        
        - <CODE::TreeCore:isWeak>::: Whether the reference is <QUOTE::weak>
             or not.
      }

  @ResourceDef: 
    @@Name: free
    @@rdf:type: DISLang|Method
    @@enDesc:
      Frees the grove referenced by this object.  Once
      this operation is done, results of operations to objects belonging
      to the grove are unknown.
    @@ForCheck: ForCompact
    @@Return:
      @@@PerlDef:
        $self->{<Q::TreeCore:node>}-><M::NodeStem.destroy>;

  @IntMethod:
    @@Name: destroy
    @@Description:
      @@@lang:en
      @@@@: Destroy this reference object.
    @@Operator:
      @@@ContentType:
        lang:Perl
      @@@@: DESTROY
    @@Return:
      @@@PerlDef:
        @@@@@:
          my $node = $self->{<Q::TreeCore:node>};
          if ($node) {
            CORE::delete $self->{<Q::TreeCore:node>};
            unless ($self->{<Q::TreeCore:isWeak>}) {
              $node->{<Q::TreeCore:rc>}--;
              unless ($node-><M::NodeStem.isExternallyReferred>) {
                $node-><M::NodeStem.destroy>;
              }
            }
          } else {
            warn ref ($self) . q{->DESTROY: there is no associated }.
                 q{node object - you have a global variable or }.
                 qq{potential memory-leak detected\n};
          }
       @@@@ImplNote:
         @@@@@lang:en
         @@@@@@:
           {P::Warning during the global destruction might mean:
              \
              - there be a loop in the manakai internal implementation - 
                it should be a bug.
              \
              - there be a loop created by application, e.g. 
                event handler containing a reference to any node 
                belonging to the same tree.
              \
              - there be a global variable that contains a node reference 
                and it is not altered or <Perl::undef>ed until the global 
                destruction. 
              \
              - or other unknown bad situation.
              \
            }
    @@ImplNote:
      @@@lang:en
      @@@@:
        Don't override this method unintentionally - for example, 
        inheritting <PerlModule::Tie::Array> would hide this method 
        from that class, since that module defines its own 
        destructor. 
##NodeRef

PropDef:
  @QName: isWeak
  @enDesc:
    Whether a reference is weak or not. 
  @rdfs:range:
    ManakaiDOM:ManakaiDONNodeReference
  @Type:
    DOMMain:boolean::ManakaiDOM:all

ElementTypeBinding:
  @Name:PropDef
  @ElementType:
    dis:ResourceDef
  @ShadowContent:
    @@rdf:type:
      rdf:Property

ElementTypeBinding:
  @Name:enDesc
  @ElementType:
    dis:Description
  @ShadowContent:
    @@lang:en

## -- Frequently used code fragments

ResourceDef:
  @QName:
    ManakaiDOM:generateUniqueID
  @rdf:type:
    dis2pm:InlineCode
  @Description:
    @@lang:en
    @@@:
      Generates a global-unique opaque string. 
      \
      {NOTE:: A URI reference is generated by this code. 
      \
      }
  @AliasFor:
    @@@:
      ::ManakaiDOM:all
    @@For:
      !=ManakaiDOM:all
  @PerlDef:
      (
        sprintf 'mid:%d.%d.%s.dom.manakai@suika.fam.cx#',
                time, $$,
                ['A'..'Z', 'a'..'z', '0'..'9']->[rand 62] .
                ['A'..'Z', 'a'..'z', '0'..'9']->[rand 62] .
                ['A'..'Z', 'a'..'z', '0'..'9']->[rand 62] .
                ['A'..'Z', 'a'..'z', '0'..'9']->[rand 62] .
                ['A'..'Z', 'a'..'z', '0'..'9']->[rand 62]
      )
##ManakaiDOM:generateUniqueID

## -- lang:dis vocabulary

TreeElementType:
  @QName:
    dis:GetProp
  @dataType:
    dis:TypeQName
  @rdfs:range:
    rdf:Property
  @Description:
    @@lang:en
    @@@:
      Gets the non-nodal value of a <Class::ManakaiDOM:ManakaiDOMNodeReference> 
      property (actualy <Class::ManakaiDOM:ManakaiDOMNodeObject> property). 

TreeElementType:
  @QName:
    dis:SetProp
  @dataType:
    dis:TypeQName
  @rdfs:range:
    rdf:Property
  @Description:
    @@lang:en
    @@@:
      Sets the non-nodal value of a <Class::ManakaiDOM:ManakaiDOMNodeReference> 
      property (actualy <Class::ManakaiDOM:ManakaiDOMNodeObject> property). 

## -- Syntax sugar

ElementTypeBinding:
  @Name: TreeElementType
  @ElementType:
    dis:ResourceDef
  @ShadowContent:
    @@rdf:type:
      DISLang:TreeElementType
    @@AliasFor:
      @@@@:
        ::ManakaiDOM:all
      @@@For:
        !=ManakaiDOM:all

ElementTypeBinding:
  @Name: ClassDef
  @ElementType:
    dis:ResourceDef
  @ShadowContent:
    @@rdf:type:
      @@@@:
        dis:MultipleResource
      @@@ForCheck:
        !ForFull !ForCompact !ManakaiDOM:ForIF
    @@rdf:type:
      @@@@:
        ManakaiDOM:IF
      @@@ForCheck:
        ManakaiDOM:ForIF
    @@rdf:type:
      @@@@:
        ManakaiDOM:Class
      @@@ForCheck: ForFull
    @@rdf:type:
      @@@@:
        ManakaiDOM:Class
      @@@ForCheck: ForCompact
    @@ForCheck:
      ManakaiDOM:Perl

ForDef:
  @QName:
    mn:ForFull
  @ISA:
    ManakaiDOM:ForClass

ForDef:
  @QName:
    mn:ForCompact
  @ISA:
    ManakaiDOM:ForClass

ElementTypeBinding:
  @Name: IntMethod
  @ElementType:
    dis:ResourceDef
  @ShadowContent:
    @@rdf:type:
      DISLang:Method
    @@ManakaiDOM:isForInternal:1

ElementTypeBinding:
  @Name: Return
  @ElementType:
    dis:ResourceDef
  @ShadowContent:
    @@rdf:type:
      DISLang:MethodReturn

ElementTypeBinding:
  @Name: Param
  @ElementType:
    dis:ResourceDef
  @ShadowContent:
    @@rdf:type:
      DISLang:MethodParameter

ElementTypeBinding:
  @Name: PerlDef
  @ElementType:
    dis:Def
  @ShadowContent:
    @@ContentType:
      lang:Perl

ElementTypeBinding:
  @Name: InCase
  @ElementType:
    dis:ResourceDef
  @ShadowContent:
    @@rdf:type:
      ManakaiDOM:InCase