= XML
== XSD

=== element semantics

simpleType       a type which has only an optional text node
complexType      a type which can have attributes and children nodes
sequence         child elements occur in the given order
choice           only one of the named child elements occurs
all              child elements occur order-independent
openContent      makes type extensible for unspecified child elements


Allow these children in any order arbitrary times:
  <xsd:choice minOccurs="0" maxOccurs="unbounded">
    <xsd:element name="child1" type="xsd:string" />
    <xsd:element name="child2" type="xsd:string" />
  </xsd:choice>

Restrict attribute to specified set of values:
  <xsd:attribute name="version" type="DocumentVersion" default="1.0"/>
  […]
  <xsd:simpleType name="DocumentVersion">
    <xsd:restriction base="xsd:string">
      <xsd:minLength value="1"/>
      <xsd:enumeration value="1.0"/>
      <xsd:enumeration value="1.1"/>
    </xsd:restriction>
  </xsd:simpleType>

=== numeric data types

byte                signed 8-bit integer
decimal             decimal value
int                 signed 32-bit integer
integer             integer value
long                signed 64-bit integer
negativeInteger     integer containing only negative values (…,-2,-1)
nonNegativeInteger  integer containing only non-negative values (0,1,2,…)
nonPositiveInteger  integer containing only non-positive values (…,-2,-1,0)
positiveInteger     integer containing only positive values (1,2,…)
short               signed 16-bit integer
unsignedLong        unsigned 64-bit integer
unsignedInt         unsigned 32-bit integer
unsignedShort       unsigned 16-bit integer
unsignedByte        unsigned 8-bit integer