GML object identifier (gml:id)
ID gml_id
This record is a draft: it has not been reviewed yet and may be incomplete or wrong. Do not rely on it for compliance decisions. Help improve it (see CONTRIBUTING.md).
Value of the gml:id attribute, the handle of an object in a Geography Markup Language (GML) document, such as a feature or a geometry in a WFS response. Its XML Schema type is ID, so the value is an XML NCName (it starts with a letter or an underscore and has no colon or space) and it is unique only within the document that contains it. It serves internal cross-references and is not a persistent identifier; GML carries stable identifiers in gml:identifier instead. GeoServer builds it from the feature type name and a number, as in states.1. GDAL reads the attribute into a string field called gml_id, so tables exported from GML or WFS data with ogr2ogr or QGIS keep it as a column. The regexp covers the NCName characters of the Basic Multilingual Plane.
- Parent datatype
- Unique identifier
id - Categories
- Geographic identifiers
- Countries
- Global (not tied to a country)
- Languages
- Common to most languages
- Quality
- 80/100 · missing: mapping (Wikidata, Schema.org, ...), detector coverage
- Metacrafter rules
- no detection rule yet
- Supported by tools
- no tool record lists this type yet
Regular expression
^[A-Z_a-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD][A-Z_a-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\-.0-9\u00B7\u0300-\u036F\u203F-\u2040]*$Python re syntax.
Examples
| Value | Description |
|---|---|
| states.1 | GeoServer feature of the topp:states sample layer |
| states.1.1 | GeoServer geometry of feature states.1 in GML 3.2 output |
| myFeature.1 | GDAL GML driver documentation |
| table1-1 | GDAL GML driver documentation, WFS join |
| topp:states.1 invalid | an NCName has no colon; topp is the namespace prefix of the feature type |
| 1.1 invalid | an NCName cannot start with a digit |
| states 1 invalid | an NCName has no space |
Translations
| Language | Name | Description |
|---|---|---|
| Russian | Идентификатор объекта GML (gml:id) |
Sources
- doc: https://gdal.org/en/stable/drivers/vector/gml.html
- doc: https://schemas.opengis.net/gml/3.2.1/gmlBase.xsd
- doc: https://www.w3.org/TR/xml-names/#NT-NCName
Use this record
- Page URL:
http://registry.apicrafter.io/datatype/gml_id - JSON: API v1 · legacy shape (used by metacrafter) · Markdown (for LLMs)
- Improve it: edit
data/datatypes/any/geo/gml_id.yamlon GitHub