name:  use this to declare what will be the name of the element in instance
            documents.
ref:  use this to refer-to an element declaration.
type:  use this to declare the datatype of the element's value in instance
          documents.
id:  use this to associate a unique identifier to the element component.
 This id has no representation in the instance document.  It is purely
 internal to the schema.  The type of this value must be xsd:ID.
form:  use this to override elementFormDefault (which is specified on the schema
 element).  There are two possible values - qualified or unqualified.
 If form is assigned the value qualified then the element must be
 namespace-qualified in instance documents.
abstract: use this to indicate that the element is only a placeholder for other elements
 which are in its substitutionGroup.  The default value for abstract is false
block:  use this to prohibit this element from being replaced by an element in its
 substitutionGroup, or prohibit this element's type from being replaced by a
 derived type.
default:  use this to give the element a default value.
fixed:  use this to give the element a fixed (constant) value.
minOccurs: use this to specify the minimum number of times that the element may
 occur in an instance document. The default value for minOccurs is 1.
maxOccurs: use this to specify the maximum number of times that the element may
 occur in an instance document. The default value for maxOccurs is 1.  Note:
          the value for minOccurs must be less than or equal to maxOccurs.
nillable: use this to assert that if there's no value available for the element then in
 the instance document we indicate it with the xsi:null attribute. The default
 value for nillable is false.
substitutionGroup: use this to indicate that this element can substitute for the element
 identified by the substitutionGroup