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Extensible Markup Language (XML)

Extensible Markup Language (XML). Extensible Markup Language (XML) is a simple, very flexible text format derived from SGML ( ISO 8879 ).

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Extensible Markup Language (XML)

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  1. Extensible Markup Language (XML) • Extensible Markup Language (XML) is a simple, very flexible text format derived from SGML (ISO 8879). • XML is a `metalanguage' — that describes other languages—which lets you design your own customized markup languages for limitless different types of documents. • XML provides a facility to define tags and the structural relationships between them. • XML is playing an increasingly important role in the exchange of a wide variety of data on the Web and elsewhere.

  2. XML, the Semantic Web & Web Services • Semantic Web: the idea of having data on the web defined and linked in a way that it can be used by machines not just for display purposes, but for automation, integration and reuse of data across various applications. • Web Services (realizing the semantic web): self-contained, self-describing, modular applications that can be published, located, and invoked across the Web.

  3. Web Services (cont.) • The technical schema for Web Services features the following: • XML: format for data exchange and description • SOAP: protocol for calling Web Services • WSDL: format for describing Web Services • UDDI: central organization for registering, finding and using Web Services

  4. Ecological Metadata Language (EML) • Ecological Metadata Language (EML) is a metadata specification developed by the ecology discipline and for the ecology discipline. • It is based on prior work done by the Ecological Society of America and associated efforts (Michener et al., 1997). Being implemented The Long Term Ecological Research (LTER) Network. • EML is implemented as a series of XML document types that can by used in a modular and extensible manner to document ecological data. • In EML, the definition of a "Data Package" is the combination of both the data and metadata for a resource. So, data packages are built by using the <eml> wrapper, which will include all of the metadata, and optionally the data (or references to them).

  5. EML (Continued..) EML was designed with the following standards in mind: • Dublin Core Metadata Initiative, • Content Standard for Digital Geospatial Metadata (CSDGM) Federal Geographic Data Committee (FGDC) and , Biological Profile of the CSDGM (from the National Biological Information Infrastructure) • International Standards Organization's Geographic Information Standard (ISO 19115) • ISO 8601 Date and Time Standard • OpenGIS Consortiums's Geography Markup Language (GML) • Scientific, Technical, and Medical Markup Language (STMML) • Extensible Scientific Interchange Language (XSIL).

  6. SensorML (http://stromboli.nsstc.uah.edu/SensorML/) • SensorML provides the models and XML schema encoding for defining the geometric, dynamic, and observational characteristics of a sensor. • provide general sensor information in support of data discovery • support the processing and analysis of the sensor measurements • support the geolocation of the measured data. • provide performance characteristics (e.g. accuracy, threshold, etc.) • archive fundamental properties and assumptions regarding sensor

  7. SensorML (http://stromboli.nsstc.uah.edu/SensorML/) • The goal is to make all types of Web-resident sensors, instruments, and imaging devices, and also repositories of sensor data, discoverable, accessible and, where applicable, controllable via the Web. • The creation of Web-based sensor networks • Being developed by Open GIS Consortium including these key partners: NASA, National Imaging and Mapping Agency and EPA.

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