http://www.w3.org/1999/xhtml
element form

Model

<form
  accept = ContentTypes
  accept-charset = Charsets
  class = xs:NMTOKENS
  dir = <TODO local simpleType in attribute>
  enctype = ContentType : application/x-www-form-urlencoded
  id = xs:ID
  lang = LanguageCode
  lang = xs:language
  method = <TODO local simpleType in attribute> : get
  onclick = Script
  ondblclick = Script
  onkeydown = Script
  onkeypress = Script
  onkeyup = Script
  onmousedown = Script
  onmousemove = Script
  onmouseout = Script
  onmouseover = Script
  onmouseup = Script
  onreset = Script
  onsubmit = Script
  style = StyleSheet
  title = Text>
((p | (h1 | h2 | h3 | h4 | h5 | h6) | div | (ul | ol | dl) | (pre | hr | blockquote | address) | fieldset | table) | (noscript | (ins | del | script) ) )*
</form>

accept

accept-charset

class

dir

enctype

id

lang

lang

In due course, we should install the relevant ISO 2- and 3-letter codes as the enumerated possible values . . .

method

onclick

ondblclick

onkeydown

onkeypress

onkeyup

onmousedown

onmousemove

onmouseout

onmouseover

onmouseup

onreset

onsubmit

style

title

Source

<xs:element name="form">
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="form.content">
        <xs:attributeGroup ref="attrs"/>
        <xs:attribute name="action" type="URI" use="required"/>
        <xs:attribute default="get" name="method">
          <xs:simpleType>
            <xs:restriction base="xs:token">
              <xs:enumeration value="get"/>
              <xs:enumeration value="post"/>
            </xs:restriction>
          </xs:simpleType>
        </xs:attribute>
        <xs:attribute default="application/x-www-form-urlencoded" name="enctype" type="ContentType"/>
        <xs:attribute name="onsubmit" type="Script"/>
        <xs:attribute name="onreset" type="Script"/>
        <xs:attribute name="accept" type="ContentTypes"/>
        <xs:attribute name="accept-charset" type="Charsets"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>