How to use the pdb2pqr.contrib.ZSI-21-a1.ZSI.wstools.XMLSchema.XMLSchemaComponent function in pdb2pqr

contents = {'xsd':['annotation', 'restriction', 'extension']}
        tag = 'complexContent'

        def isMixed(self):
            m = self.getAttribute('mixed')
            if m == 0 or m == False:
                return False
            if isinstance(m, basestring) is True:
                if m in ('false', '0'):
                    return False
                if m in ('true', '1'):
                    return True
            raise SchemaError, 'invalid value for attribute mixed(%s): %s'\
                %(m, self.getItemTrace())

        class _DerivationBase(XMLSchemaComponent):
            """,
               parents:
                   complexContent
               attributes:
                   id -- ID
                   base -- QName, required

               contents:
                   annotation?, (group | all | choice | sequence)?, 
                       (attribute | attributeGroup)*, anyAttribute?
            """
            required = ['base']
            attributes = {'id':None, 
                'base':None }
            contents = {'xsd':['annotation', 'group', 'all', 'choice',\
                'sequence', 'attribute', 'attributeGroup', 'anyAttribute']}

element
       attributes:
           id -- ID
           mixed -- boolean, false

       contents:
           annotation?, (simpleContent | complexContent | 
           ((group | all | choice | sequence)?, (attribute | attributeGroup)*, anyAttribute?))
    """
    required = []
    attributes = {'id':None, 
        'mixed':0}
    tag = 'complexType'
    

class SimpleType(XMLSchemaComponent,\
                 DefinitionMarker,\
                 SimpleMarker):
    """
       parents:
           redefine, schema
       attributes:
           id -- ID
           name -- NCName, required
           final -- ('#all' | ('extension' | 'restriction' | 'list' | 'union')*), 
               schema.finalDefault 

       contents:
           annotation?, (restriction | list | union)
    """
    required = ['name']
    attributes = {'id':None,

def getTypeDefinition(self, attribute=None):
        """If attribute is None, "type" is assumed, return the corresponding
        representation of the global type definition (TypeDefinition),
        or the local definition if don't find "type".  To maintain backwards
        compat, if attribute is provided call base class method.
        """
        if attribute:
            return XMLSchemaComponent.getTypeDefinition(self, attribute)
        gt = XMLSchemaComponent.getTypeDefinition(self, 'type')
        if gt:
            return gt
        return self.content

content.append(ModelGroupReference(self))
                elif component == 'choice':
                    content.append(Choice(self))
                elif component == 'sequence':
                    content.append(Sequence(self))
                elif component == 'any':
                    content.append(ElementWildCard(self))
                else:
                    raise SchemaError, 'Unknown component (%s)' %(i.getTagName())
                content[-1].fromDom(i)
            else:
                raise SchemaError, 'Unknown component (%s)' %(i.getTagName())
        self.content = tuple(content)


class ModelGroupDefinition(XMLSchemaComponent,\
                           ModelGroupMarker,\
                           DefinitionMarker):
    """
       parents:
           redefine, schema
       attributes:
           id -- ID
           name -- NCName,  required

       contents:
           annotation?, (all | choice | sequence)?
    """
    required = ['name']
    attributes = {'id':None, 
        'name':None}
    contents = {'xsd':['annotation', 'all', 'choice', 'sequence']}

content = []

        for i in contents:
            component = SplitQName(i.getTagName())[1]
            if component == 'documentation':
                #print_debug('class %s, documentation skipped' %self.__class__, 5)
                continue
            elif component == 'appinfo':
                #print_debug('class %s, appinfo skipped' %self.__class__, 5)
                continue
            else:
                raise SchemaError, 'Unknown component (%s)' %(i.getTagName())
        self.content = tuple(content)


    class Documentation(XMLSchemaComponent):
        """
           parent:
               annotation
           attributes:
               source, anyURI
               xml:lang, language
           contents:
               mixed, any
        """
        attributes = {'source':None, 'xml:lang':None}
        contents = {'xsd':('mixed', 'any')}
        tag = 'documentation'

        def __init__(self, parent):
            XMLSchemaComponent.__init__(self, parent)
            self.content = None

self.annotation.fromDom(i)
                    continue
                elif component == 'all' and not self.content:
                    self.content = All(self)
                elif component == 'choice' and not self.content:
                    self.content = Choice(self)
                elif component == 'sequence' and not self.content:
                    self.content = Sequence(self)
                else:
                    raise SchemaError, 'Unknown component (%s)' %(i.getTagName())
                self.content.fromDom(i)
            else:
                raise SchemaError, 'Unknown component (%s)' %(i.getTagName())


class ModelGroupReference(XMLSchemaComponent,\
                          ModelGroupMarker,\
                          ReferenceMarker):
    """
       parents:
           choice, complexType, extension, restriction, sequence
       attributes:
           id -- ID
           ref -- NCName,  required
           minOccurs -- Whole Number, 1
           maxOccurs -- (Whole Number | 'unbounded'), 1

       contents:
           annotation?
    """
    required = ['ref']
    attributes = {'id':None,

content.append(AttributeReference(self))
                        else:
                            content.append(LocalAttributeDeclaration(self))
                    elif component == 'attributeGroup':
                        content.append(AttributeGroupReference(self))
                    elif component == 'anyAttribute':
                        content.append(AttributeWildCard(self))
                    else:
                        raise SchemaError, 'Unknown component (%s)'\
                            %(contents[indx].getTagName())
                    content[-1].fromDom(contents[indx])
                    indx += 1
                self.attr_content = tuple(content)


        class Restriction(XMLSchemaComponent,\
                          RestrictionMarker):
            """
               parents:
                   simpleContent
               attributes:
                   id -- ID
                   base -- QName, required

               contents:
                   annotation?, simpleType?, (enumeration | length | 
                   maxExclusive | maxInclusive | maxLength | minExclusive | 
                   minInclusive | minLength | pattern | fractionDigits | 
                   totalDigits | whiteSpace)*, (attribute | attributeGroup)*, 
                   anyAttribute?
            """
            required = ['base']

def getElementDeclaration(self, attribute=None):
        """If attribute is None, "ref" is assumed, return the corresponding
        representation of the global element declaration (ElementDeclaration),
        To maintain backwards compat, if attribute is provided call base class method.
        """
        if attribute:
            return XMLSchemaComponent.getElementDeclaration(self, attribute)
        return XMLSchemaComponent.getElementDeclaration(self, 'ref')

if component == 'attribute':
                    if contents[indx].hasattr('ref'):
                        self.attr_content.append(AttributeReference(self))
                    else:
                        self.attr_content.append(LocalAttributeDeclaration(self))
                elif component == 'attributeGroup':
                    self.attr_content.append(AttributeGroupReference(self))
                elif component == 'anyAttribute':
                    self.attr_content.append(AttributeWildCard(self))
                else:
                    raise SchemaError, 'Unknown component (%s): %s' \
                        %(contents[indx].getTagName(),self.getItemTrace())
                self.attr_content[-1].fromDom(contents[indx])
                indx += 1

    class _DerivedType(XMLSchemaComponent):
        def __init__(self, parent):
            XMLSchemaComponent.__init__(self, parent)
            self.annotation = None
            # XXX remove attribute derivation, inconsistent
            self.derivation = None
            self.content = None

        def fromDom(self, node):
            self.setAttributes(node)
            contents = self.getContents(node)

            for i in contents:
                component = SplitQName(i.getTagName())[1]
                if component in self.__class__.contents['xsd']:
                    if component == 'annotation' and not self.annotation:
                        self.annotation = Annotation(self)

self.annotation.fromDom(child)
                continue
            break
        else:
            return
        if component == 'restriction':
            self.content = self.__class__.Restriction(self)
        elif component == 'list':
            self.content = self.__class__.List(self)
        elif component == 'union':
            self.content = self.__class__.Union(self)
        else:
            raise SchemaError, 'Unknown component (%s)' %(component)
        self.content.fromDom(child)

    class Restriction(XMLSchemaComponent,\
                      RestrictionMarker):
        """
           parents:
               simpleType
           attributes:
               id -- ID
               base -- QName, required or simpleType child

           contents:
               annotation?, simpleType?, (enumeration | length | 
               maxExclusive | maxInclusive | maxLength | minExclusive | 
               minInclusive | minLength | pattern | fractionDigits | 
               totalDigits | whiteSpace)*
        """
        attributes = {'id':None, 
            'base':None }