grids

Table of Contents

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Schema Document Properties

Target Namespacehttp://www.opengis.net/gml
Version3.2.0
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.
Schema Composition
DocumentationSee ISO/DIS 19136 20.2. An implicit description of geometry is one in which the items of the geometry do not explicitly appear in the encoding. Instead, a compact notation records a set of parameters, and a set of objects may be generated using a rule with these parameters. This Clause provides grid geometries that are used in the description of gridded coverages and other applications. In GML two grid structures are defined, namely gml:Grid and gml:RectifiedGrid.
Application Datagrids.xsd
More information at: urn:ogc:specification:gml:schema-xsd:grids:3.2.0.

Declared Namespaces

PrefixNamespace
Default namespacehttp://www.w3.org/2001/XMLSchema
xmlhttp://www.w3.org/XML/1998/namespace
gmlhttp://www.opengis.net/gml
xlinkhttp://www.w3.org/1999/xlink
Schema Component Representation
<schema targetNamespace="http://www.opengis.net/gml" elementFormDefault="qualified" version="3.2.0">
<include schemaLocation="geometryBasic0d1d.xsd"/>
...
</schema>
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Global Declarations

Element: AbstractImplicitGeometry

NameAbstractImplicitGeometry
Typegml:AbstractGeometryType
Nillableno
Abstractyes
XML Instance Representation
<gml:AbstractImplicitGeometry
gml:id="[1]"
srsName="anyURI [0..1]"
srsDimension="positiveInteger [0..1]"
axisLabels="gml:NCNameList [0..1]"
uomLabels="gml:NCNameList [0..1]">
<gml:metaDataProperty> ... </gml:metaDataProperty> [0..*]
<gml:description> ... </gml:description> [0..1]
<gml:descriptionReference> ... </gml:descriptionReference> [0..1]
<gml:identifier> ... </gml:identifier> [0..1]
<gml:name> ... </gml:name> [0..*]
</gml:AbstractImplicitGeometry>
Schema Component Representation
<element name="AbstractImplicitGeometry" type="gml:AbstractGeometryType" abstract="true" substitutionGroup="gml:AbstractGeometry"/>
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Element: Grid

NameGrid
Typegml:GridType
Nillableno
Abstractno
DocumentationThe gml:Grid implicitly defines an unrectified grid, which is a network composed of two or more sets of curves in which the members of each set intersect the members of the other sets in an algorithmic way. The region of interest within the grid is given in terms of its gml:limits, being the grid coordinates of diagonally opposed corners of a rectangular region. gml:axisLabels is provided with a list of labels of the axes of the grid (gml:axisName has been deprecated). gml:dimension specifies the dimension of the grid. The gml:limits element contains a single gml:GridEnvelope. The gml:low and gml:high property elements of the envelope are each integerLists, which are coordinate tuples, the coordinates being measured as offsets from the origin of the grid along each axis, of the diagonally opposing corners of a “rectangular” region of interest.
XML Instance Representation
<gml:Grid
gml:id="[1]"
srsName="anyURI [0..1]"
srsDimension="positiveInteger [0..1]"
axisLabels="gml:NCNameList [0..1]"
uomLabels="gml:NCNameList [0..1]"
dimension="positiveInteger [1]">
<gml:metaDataProperty> ... </gml:metaDataProperty> [0..*]
<gml:description> ... </gml:description> [0..1]
<gml:descriptionReference> ... </gml:descriptionReference> [0..1]
<gml:identifier> ... </gml:identifier> [0..1]
<gml:name> ... </gml:name> [0..*]
<gml:limits> gml:GridLimitsType </gml:limits> [1]
Start Choice [1]
<gml:axisLabels> gml:NCNameList </gml:axisLabels> [1]
<gml:axisName> string </gml:axisName> [1..*]
End Choice
</gml:Grid>
Schema Component Representation
<element name="Grid" type="gml:GridType" substitutionGroup="gml:AbstractImplicitGeometry"/>
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Element: RectifiedGrid

  • This element can be used wherever the following element is referenced:
NameRectifiedGrid
Typegml:RectifiedGridType
Nillableno
Abstractno
DocumentationA rectified grid is a grid for which there is an affine transformation between the grid coordinates and the coordinates of an external coordinate reference system. It is defined by specifying the position (in some geometric space) of the grid “origin” and of the vectors that specify the post locations. Note that the grid limits (post indexes) and axis name properties are inherited from gml:GridType and that gml:RectifiedGrid adds a gml:origin property (contains or references a gml:Point) and a set of gml:offsetVector properties.
XML Instance Representation
<gml:RectifiedGrid
gml:id="[1]"
srsName="anyURI [0..1]"
srsDimension="positiveInteger [0..1]"
axisLabels="gml:NCNameList [0..1]"
uomLabels="gml:NCNameList [0..1]"
dimension="positiveInteger [1]">
<gml:metaDataProperty> ... </gml:metaDataProperty> [0..*]
<gml:description> ... </gml:description> [0..1]
<gml:descriptionReference> ... </gml:descriptionReference> [0..1]
<gml:identifier> ... </gml:identifier> [0..1]
<gml:name> ... </gml:name> [0..*]
<gml:limits> gml:GridLimitsType </gml:limits> [1]
Start Choice [1]
<gml:axisLabels> gml:NCNameList </gml:axisLabels> [1]
<gml:axisName> string </gml:axisName> [1..*]
End Choice
<gml:origin> gml:PointPropertyType </gml:origin> [1]
<gml:offsetVector> gml:VectorType </gml:offsetVector> [1..*]
</gml:RectifiedGrid>
Schema Component Representation
<element name="RectifiedGrid" type="gml:RectifiedGridType" substitutionGroup="gml:Grid"/>
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Global Definitions

Complex Type: GridEnvelopeType

Super-types:None
Sub-types:None
NameGridEnvelopeType
Abstractno
XML Instance Representation
<...>
<gml:low> gml:integerList </gml:low> [1]
<gml:high> gml:integerList </gml:high> [1]
</...>
Schema Component Representation
<complexType name="GridEnvelopeType">
<sequence>
<element name="low" type="gml:integerList"/>
<element name="high" type="gml:integerList"/>
</sequence>
</complexType>
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Complex Type: GridLimitsType

Super-types:None
Sub-types:None
NameGridLimitsType
Abstractno
XML Instance Representation
<...>
<gml:GridEnvelope> gml:GridEnvelopeType </gml:GridEnvelope> [1]
</...>
Schema Component Representation
<complexType name="GridLimitsType">
<sequence>
<element name="GridEnvelope" type="gml:GridEnvelopeType"/>
</sequence>
</complexType>
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Complex Type: GridType

Super-types:gml:AbstractGeometryType < GridType (by extension)
Sub-types:
NameGridType
Abstractno
XML Instance Representation
<...
gml:id="[1]"
srsName="anyURI [0..1]"
srsDimension="positiveInteger [0..1]"
axisLabels="gml:NCNameList [0..1]"
uomLabels="gml:NCNameList [0..1]"
dimension="positiveInteger [1]">
<gml:description> ... </gml:description> [0..1]
<gml:identifier> ... </gml:identifier> [0..1]
<gml:name> ... </gml:name> [0..*]
<gml:limits> gml:GridLimitsType </gml:limits> [1]
Start Choice [1]
<gml:axisLabels> gml:NCNameList </gml:axisLabels> [1]
<gml:axisName> string </gml:axisName> [1..*]
End Choice
</...>
Schema Component Representation
<complexType name="GridType">
<complexContent>
<extension base="gml:AbstractGeometryType">
<sequence>
<element name="limits" type="gml:GridLimitsType"/>
<choice>
<element name="axisLabels" type="gml:NCNameList"/>
<element name="axisName" type="string" maxOccurs="unbounded"/>
</choice>
</sequence>
<attribute name="dimension" type="positiveInteger" use="required"/>
</extension>
</complexContent>
</complexType>
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Complex Type: RectifiedGridType

Super-types:gml:AbstractGeometryType < GridType (by extension) < RectifiedGridType (by extension)
Sub-types:None
NameRectifiedGridType
Abstractno
XML Instance Representation
<...
gml:id="[1]"
srsName="anyURI [0..1]"
srsDimension="positiveInteger [0..1]"
axisLabels="gml:NCNameList [0..1]"
uomLabels="gml:NCNameList [0..1]"
dimension="positiveInteger [1]">
<gml:description> ... </gml:description> [0..1]
<gml:identifier> ... </gml:identifier> [0..1]
<gml:name> ... </gml:name> [0..*]
<gml:limits> gml:GridLimitsType </gml:limits> [1]
Start Choice [1]
<gml:axisLabels> gml:NCNameList </gml:axisLabels> [1]
<gml:axisName> string </gml:axisName> [1..*]
End Choice
<gml:origin> gml:PointPropertyType </gml:origin> [1]
<gml:offsetVector> gml:VectorType </gml:offsetVector> [1..*]
</...>
Schema Component Representation
<complexType name="RectifiedGridType">
<complexContent>
<extension base="gml:GridType">
<sequence>
<element name="origin" type="gml:PointPropertyType"/>
<element name="offsetVector" type="gml:VectorType" maxOccurs="unbounded"/>
</sequence>
</extension>
</complexContent>
</complexType>
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Legend

Complex Type:

Schema Component Type

AusAddress

Schema Component Name
Super-types:Address < AusAddress (by extension)
Sub-types:
  • QLDAddress (by restriction)
If this schema component is a type definition, its type hierarchy is shown in a gray-bordered box.
NameAusAddress
Abstractno
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.

Schema Component Representation
<complexTypename="AusAddress">
<complexContent>
<extensionbase="Address">
<sequence>
<elementname="state" type="AusStates"/>
<elementname="postcode">
<simpleType>
<restrictionbase="string">
<patternvalue="[1-9][0-9]{3}"/>
</restriction>
</simpleType>
</element>
</sequence>
<attributename="country" type="string" fixed="Australia"/>
</extension>
</complexContent>
</complexType>
The Schema Component Representation table above displays the underlying XML representation of the schema component. (Annotations are not shown.)
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Glossary

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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