<description>A coordinate reference system based on an ellipsoidal approximation of the geoid; provides an accurate representation of the geometry of geographic features for a large portion of the earth's surface. </description>
<description>A coordinate reference system used for recording of heights or depths. Vertical CRSs make use of the direction of gravity to define the concept of height or depth, but the relationship with gravity may not be straightforward. </description>
<description>A coordinate reference system with the origin at the centre of mass of the earth. A geocentric CRS deals with the earth's curvature by taking a 3D spatial view. </description>
<description>Axis positive direction is north. In a geographic or projected CRS, north is defined through the geodetic datum. In an engineering CRS, north may be defined with respect to an engineering object rather than a geographical direction. </description>
<description>Axis positive direction is in the equatorial plane from the centre of the modelled earth towards the intersection of the equator with the prime meridian. </description>
<description>Axis positive direction is in the equatorial plane from the centre of the modelled earth towards the intersection of the equator and the meridian pi/2 radians eastwards from the prime meridian. </description>
<!-- Primary editor: Arliss Whiteside. Last updated 2005-11-16 -->
<name>parameterType standard values</name>
<name>Data type of an operation parameter. Usually refers to a data type defined in measures.xsd or allowed in the ParameterValueType of coordinateOperations.xsd. </name>
<description>Value of a length (or distance) quantity, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a length, such as metres or feet. </description>
<description>Value of a scale factor (or ratio) that has no physical unit. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a scale factor, such as one, percent, permil, or parts-per-million. </description>
<description>Value of a time or temporal quantity, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a time value, such as seconds or weeks. </description>
<description>Value of a length (or distance) quantity in a grid, where the grid spacing does not have any associated physical units, or does not have a constant physical spacing. This grid length will often be used in a digital image grid, where the base units are likely to be pixel spacings. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for length along the axes of a grid, such as pixel spacings or grid spacings.</description>
<description>Value of an angle quantity recorded as a single number, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for an angle, such as degrees or radians. </description>
<description>Value of a length or angle quantity, where an angle can be recorded in either degree-minute-second format or single value format. Often used for horizontal ground coordinates. </description>
<namecodeSpace="urn:ogc:tc:urn:doc:cr:05-060">urn:ogc:def:dataType:OGC:1.0:length or angle</name>
<description>Positive integer value of an operation parameter, usually used for a count. An integer value does not have an associated unit of measure. </description>
<description>Ordered sequence of two or more numeric values of an operation parameter list, where each value has the same associated unit of measure. An element of this type contains a space-separated list of double values. </description>
<description>Ordered sequence of two or more numeric values of an operation parameter list of Length measures. Each value has the same associated unit of measure suitable for a length, such as metres or feet. An element of this type contains a space-separated list of double values. </description>
<description>Ordered sequence of two or more numeric values of an operation parameter list of Scale measures. Each value has the same associated unit of measure suitable for a scale factor, such as one, percent, permil, or parts-per-million. An element of this type contains a space-separated list of double values. </description>
<description>Ordered sequence of two or more numeric values of an operation parameter list of Angle measures, each recorded as a single number. Each value has the same associated unit of measure suitable for an angle, such as degrees or radians. An element of this type contains a space-separated list of double values. </description>
<description>Ordered sequence of two or more numeric values of an operation parameter list of Time measures, each recorded as a single number. Each value has the same associated unit of measure suitable for a time value, such as seconds or days. An element of this type contains a space-separated list of double values. </description>
<description>Ordered sequence of two or more numeric values of an operation parameter list of Grid Length measures. Each value has the same associated unit of measure suitable for length along the axes of a grid, such as pixel spacings or grid spacings. An element of this type contains a space-separated list of double values. </description>
<description>Ordered sequence of two or more numeric values of an operation parameter list of Velocity measures. Each value has the same associated unit of measure suitable for a velocity, such as metres per second or miles per hour. An element of this type contains a space-separated list of double values. </description>
<description>Ordered sequence of two or more integer values of an operation parameter list, usually used for counts. These integer values do not have an associated unit of measure. An element of this type contains a space-separated list of integer values. </description>
<description>Ordered sequence of two or more positive integer values of an operation parameter list, usually used for counts. These integer values do not have an associated unit of measure. An element of this type contains a space-separated list of integer values. </description>
<description>Reference to a file or a part of a file containing one or more parameter values, each numeric value with its associated unit of measure. When referencing a part of a file, that file must contain multiple identified parts, such as an XML encoded document. Furthermore, the referenced file or part of a file can reference another part of the same or different files, as allowed in XML documents. </description>
<description>A coordinate reference system based on an ellipsoidal approximation of the geoid; provides an accurate representation of the geometry of geographic features for a large portion of the earth's surface. </description>
<description>A coordinate reference system used for recording of heights or depths. Vertical CRSs make use of the direction of gravity to define the concept of height or depth, but the relationship with gravity may not be straightforward. </description>
<description>A coordinate reference system with the origin at the centre of mass of the earth. A geocentric CRS deals with the earth's curvature by taking a 3D spatial view. </description>
<description>The origin of the image coordinate system is at the corner of a grid cell, or half-way between the centres of adjacent image pixels. </description>
<description>The axis is continuous with values wrapping around at the minimumValue and maximumValue. Values with the same meaning repeat modulo the difference between maximumValue and minimumValue. </description>
<description>The zero value of the associated vertical coordinate system axis is defined to approximate a constant potential surface, usually the geoid. Such a reference surface is usually determined by a national or scientific authority, and is then a well-known, named datum. </description>
<description>The zero point of the vertical axis is defined by a surface that has meaning for the purpose which the associated vertical measurements are used for. For hydrographic charts, this is often a predicted nominal sea surface (i.e., without waves or other wind and current effects) that occurs at low tide. </description>
<description>In some cases, e.g. oil exploration and production, a geological feature, such as the top or bottom of a geologically identifiable and meaningful subsurface layer, is used as a vertical datum. Other variations to the above three vertical datum types may exist and are all included in this type. </description>
<documentation>Name or code with an (optional) authority. Text token.
If the codeSpace attribute is present, then its value should identify a dictionary, thesaurus or authority for the term, such as the organisation who assigned the value, or the dictionary from which it is taken.
A text string with an optional codeSpace attribute. </documentation>
<documentation>A definition, which can be included in or referenced by a dictionary. In this extended type, the inherited "description" optional element can hold the definition whenever only text is needed. The inherited "name" elements can provide one or more brief terms for which this is the definition. The inherited "metaDataProperty" elements can be used to reference or include more information about this definition.
The gml:id attribute is required - it must be possible to reference this definition using this handle. </documentation>
<documentation>A non-abstract bag that is specialized for use as a dictionary which contains a set of definitions. These definitions are referenced from other places, in the same and different XML documents. In this restricted type, the inherited optional "description" element can be used for a description of this dictionary. The inherited optional "name" element can be used for the name(s) of this dictionary. The inherited "metaDataProperty" elements can be used to reference or contain more information about this dictionary. The inherited required gml:id attribute allows the dictionary to be referenced using this handle. </documentation>
</annotation>
<complexContent>
<extensionbase="gml:DefinitionType">
<sequenceminOccurs="0"maxOccurs="unbounded">
<choice>
<elementref="gml:dictionaryEntry">
<annotation>
<documentation>An entry in this dictionary. The content of an entry can itself be a lower level dictionary or definition collection. This element follows the standard GML property model, so the value may be provided directly or by reference. Note that if the value is provided by reference, this definition does not carry a handle (gml:id) in this context, so does not allow external references to this specific entry in this context. When used in this way the referenced definition will usually be in a dictionary in the same XML document. </documentation>
<documentation>An entry in a dictionary of definitions. An instance of this type contains one definition object. Specialized descendents of this dictionaryEntry might be restricted in an application schema to allow only including specified types of definitions as valid entries in a dictionary. </documentation>
</annotation>
<sequence>
<elementref="gml:Definition">
<annotation>
<documentation>This element in a dictionary entry contains the actual definition. </documentation>
<!-- =========== Abstract "Object" is "anyType" ============= -->
<!-- ===== Global element at the head of the "Object" substitution group ======== -->
<elementname="_Object"abstract="true">
<annotation>
<documentation>This abstract element is the head of a substitutionGroup hierararchy which may contain either simpleContent or complexContent elements. It is used to assert the model position of "class" elements declared in other GML schemas.</documentation>
<documentation>Global element which acts as the head of a substitution group that may include any element which is a GML feature, object, geometry or complex value</documentation>
<documentation>This content model group makes it easier to construct types that derive from AbstractGMLType and its descendents "by restriction". A reference to the group saves having to enumerate the standard object properties.</documentation>
<documentation>Multiple names may be provided. These will often be distinguished by being assigned by different authorities, as indicated by the value of the codeSpace attribute. In an instance document there will usually only be one name per authority.</documentation>
<documentation>All complexContent GML elements are directly or indirectly derived from this abstract supertype to establish a hierarchy of GML types that may be distinguished from other XML types by their ancestry. Elements in this hierarchy may have an ID and are thus referenceable.</documentation>
<documentation>Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods. This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.</documentation>
<documentation>Label for the object, normally a descriptive name. An object may have several names, typically assigned by different authorities. The authority for a name is indicated by the value of its (optional) codeSpace attribute. The name may or may not be unique, as determined by the rules of the organization responsible for the codeSpace.</documentation>
