XML Schema Documentation xaal-datatypes.xsd

Schema Document Properties

Target Namespace http://www.cs.hut.fi/Research/SVG/XAAL
Version 0.1
Element and Attribute Namespaces
  • Global element and attribute declarations belong to this schema's target namespace.
  • By default, local element declarations belong to this schema's target namespace.
  • By default, local attribute declarations have no namespace.
Documentation This schema defines some of the datatypes used in eXtensible Algorithm Animation Language (XAAL).

Declared Namespaces

Prefix Namespace
Default namespace http://www.cs.hut.fi/Research/SVG/XAAL
xml http://www.w3.org/XML/1998/namespace
xs http://www.w3.org/2001/XMLSchema
html http://www.w3.org/1999/xhtml

Schema Component Representation

<xs:schema targetNamespace="http://www.cs.hut.fi/Research/SVG/XAAL" elementFormDefault="qualified" attributeFormDefault="unqualified" version="0.1">

Global Definitions

Simple Type: anchor

Super-types: xs:token < anchor (by restriction)
Sub-types: None
Name anchor
  • Base XSD Type: token
  • value comes from list: {'NW'|'N'|'NE'|'E'|'SE'|'S'|'SW'|'W'|'C'|'CENTER'}
Documentation Type used when specifying the anchor when refering to object's bounding box. The possible values are 'NW', 'N', 'NE', 'E', 'SE', 'S', 'SW', 'W', 'C', and 'CENTER'.

Schema Component Representation

<xs:simpleType name="anchor">
<xs:restriction base="xs:token">
<xs:enumeration value="NW"/>
<xs:enumeration value="N"/>
<xs:enumeration value="NE"/>
<xs:enumeration value="E"/>
<xs:enumeration value="SE"/>
<xs:enumeration value="S"/>
<xs:enumeration value="SW"/>
<xs:enumeration value="W"/>
<xs:enumeration value="C"/>
<xs:enumeration value="CENTER"/>

Simple Type: color-name

Super-types: xs:token < color-name (by restriction)
Sub-types: None
Name color-name
  • Base XSD Type: token
  • pattern = maroon|red|orange|yellow|olive|purple|fuchsia|white|lime|green|navy|aqua|teal|black|silver|gray|blue
Documentation Predefined colors in Xaal are specified by this type. The colors are the same as in <a href="http://www.w3.org/TR/CSS21/syndata.html#value-def-color"> CSS2</a>: aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, orange, purple, red, silver, teal, white, and yellow
maroon red orange yellow
olive purple fuchsia white
lime green navy aqua
teal black silver gray

Schema Component Representation

<xs:simpleType name="color-name">
<xs:restriction base="xs:token">
<xs:pattern value="maroon|red|orange|yellow|olive|purple|fuchsia|white|lime|green|navy|aqua|teal|black|silver|gray|blue"/>

Simple Type: opacity

Super-types: xs:double < opacity (by restriction)
Sub-types: None
Name opacity
  • Base XSD Type: double
  • 0 <= value <= 1
Documentation Opacity of an object. The value is a decimal number between 0 and 1, inclusive.

Schema Component Representation

<xs:simpleType name="opacity">
<xs:restriction base="xs:double">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="1"/>

Simple Type: rgb-value

Super-types: xs:nonNegativeInteger < rgb-value (by restriction)
Sub-types: None
Name rgb-value
  • Base XSD Type: nonNegativeInteger
  • value <= 255
Documentation Type used in the RGB values. The value must be between 0 and 255, inclusive.

Schema Component Representation

<xs:simpleType name="rgb-value">
<xs:restriction base="xs:nonNegativeInteger">
<xs:maxInclusive value="255"/>

Simple Type: stroke-type

Super-types: xs:token < stroke-type (by restriction)
Sub-types: None
Name stroke-type
  • Base XSD Type: token
  • value comes from list: {'dashed'|'solid'|'dotted'}
Documentation Defines the allowed stroke types in Xaal. Valid values are 'dashed', 'solid', and 'dotted'.

Schema Component Representation

<xs:simpleType name="stroke-type">
<xs:restriction base="xs:token">
<xs:enumeration value="dashed"/>
<xs:enumeration value="solid"/>
<xs:enumeration value="dotted"/>


Complex Type:

Schema Component Type


Schema Component Name
Super-types: Address < AusAddress (by extension)
  • QLDAddress (by restriction)
If this schema component is a type definition, its type hierarchy is shown in a gray-bordered box.
Name AusAddress
Abstract no
The table above displays the properties of this schema component.
XML Instance Representation
<... country="Australia" >
<unitNo> string </unitNo> [0..1]
<houseNo> string </houseNo> [1]
<street> string </street> [1]
Start Choice [1]
<city> string </city> [1]
<town> string </town> [1]
End Choice
<state> AusStates </state> [1]
<postcode> string <<pattern = [1-9][0-9]{3}>> </postcode> [1]

The XML Instance Representation table above shows the schema component's content as an XML instance.

  • The minimum and maximum occurrence of elements and attributes are provided in square brackets, e.g. [0..1].
  • Model group information are shown in gray, e.g. Start Choice ... End Choice.
  • For type derivations, the elements and attributes that have been added to or changed from the base type's content are shown in bold.
  • If an element/attribute has a fixed value, the fixed value is shown in green, e.g. country="Australia".
  • Otherwise, the type of the element/attribute is displayed.
    • If the element/attribute's type is in the schema, a link is provided to it.
    • For local simple type definitions, the constraints are displayed in angle brackets, e.g. <<pattern = [1-9][0-9]{3}>>.

Schema Component Representation
<complexType name="AusAddress">
<extension base=" Address ">
<element name="state" type=" AusStates "/>
<element name="postcode">
<restriction base=" string ">
<pattern value="[1-9][0-9]{3}"/>
<attribute name="country" type=" string " fixed="Australia"/>

The Schema Component Representation table above displays the underlying XML representation of the schema component. (Annotations are not shown.)


Term Description
Abstract (Applies to complex type definitions and element declarations). An abstract element or complex type cannot used to validate an element instance. If there is a reference to an abstract element, only element declarations that can substitute the abstract element can be used to validate the instance. For references to abstract type definitions, only derived types can be used.
All Model Group Child elements can be provided in any order in instances. See: http://www.w3.org/TR/xmlschema-1/#element-all.
Choice Model Group Only one from the list of child elements and model groups can be provided in instances. See: http://www.w3.org/TR/xmlschema-1/#element-choice.
Collapse Whitespace Policy Replace tab, line feed, and carriage return characters with space character (Unicode character 32). Then, collapse contiguous sequences of space characters into single space character, and remove leading and trailing space characters.
Disallowed Substitutions (Applies to element declarations). If substitution is specified, then substitution group members cannot be used in place of the given element declaration to validate element instances. If derivation methods, e.g. extension, restriction, are specified, then the given element declaration will not validate element instances that have types derived from the element declaration's type using the specified derivation methods. Normally, element instances can override their declaration's type by specifying an xsi:type attribute.
Key Constraint Like Uniqueness Constraint, but additionally requires that the specified value(s) must be provided. See: http://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions.
Key Reference Constraint Ensures that the specified value(s) must match value(s) from a Key Constraint or Uniqueness Constraint. See: http://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions.
Model Group Groups together element content, specifying the order in which the element content can occur and the number of times the group of element content may be repeated. See: http://www.w3.org/TR/xmlschema-1/#Model_Groups.
Nillable (Applies to element declarations). If an element declaration is nillable, instances can use the xsi:nil attribute. The xsi:nil attribute is the boolean attribute, nil, from the http://www.w3.org/2001/XMLSchema-instance namespace. If an element instance has an xsi:nil attribute set to true, it can be left empty, even though its element declaration may have required content.
Notation A notation is used to identify the format of a piece of data. Values of elements and attributes that are of type, NOTATION, must come from the names of declared notations. See: http://www.w3.org/TR/xmlschema-1/#cNotation_Declarations.
Preserve Whitespace Policy Preserve whitespaces exactly as they appear in instances.
Prohibited Derivations (Applies to type definitions). Derivation methods that cannot be used to create sub-types from a given type definition.
Prohibited Substitutions (Applies to complex type definitions). Prevents sub-types that have been derived using the specified derivation methods from validating element instances in place of the given type definition.
Replace Whitespace Policy Replace tab, line feed, and carriage return characters with space character (Unicode character 32).
Sequence Model Group Child elements and model groups must be provided in the specified order in instances. See: http://www.w3.org/TR/xmlschema-1/#element-sequence.
Substitution Group Elements that are members of a substitution group can be used wherever the head element of the substitution group is referenced.
Substitution Group Exclusions (Applies to element declarations). Prohibits element declarations from nominating themselves as being able to substitute a given element declaration, if they have types that are derived from the original element's type using the specified derivation methods.
Target Namespace The target namespace identifies the namespace that components in this schema belongs to. If no target namespace is provided, then the schema components do not belong to any namespace.
Uniqueness Constraint Ensures uniqueness of an element/attribute value, or a combination of values, within a specified scope. See: http://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions.
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