This example is an analogous standard to the XML Research Article Metadata standard, except in the JSON-LD format.  Starting from the ChAMP JSON-LD context a research article context was developed to mirror the metadata in the XML version.  Note below that unlike the XML version the context only needs to define those name/value pairs that are not already defined in the ChAMP context.  This is because JSON-LD is more free form than XML and does not require elements to be in any particular order - the reason the W3C committee did not call the context a 'schema'.

Looking at the equivalent example article file below we see the cleaner nature of the JSON format where {} define objects and [] define arrays.  This file can be downloaded here.  To convert the file to different JSON-LD formats and RDF visit the JSON-LD Playground (NOTE:  the contexts for the standard are available at https://chalk.coas.unf.edu so that they work correctly with the JSON-LD playground).

Example File - DOI:10.1021/ac503447m

Although ChAMP is a platform of metadata that is not tied to any one format for implementation, in terms of translating to potential users ChAMPs useablility, it is necessary to create some example applications. In thinking about these applications it became obvious that an additional resource the project should provide was a schema for XML based implementations of the platform (schema equivalents for other formats are in development).

The schema can be downloaded here.  Below are graphical representations of the main categories of metadata were identified as being important to characterize a chemical analysis (sorry for the size of the page).

As a first example of the use of ChAMP in creation of a standard, research article metadata was chosen.  When we research the literature, we see that publishers provide keywords with the bibliographic information and the abstract on the page for the article.  While the keywords are important - they are what the papers' author(s) think are important facets of the research described - they are not standardized and thus do not really fit the needs of the readers of the paper.

In most cases, we find a paper via a text search of the title and abstract and then look for specific metadata (detection limit, analysis time, instrumentation, method accuracy, etc.) to evaluate whether it is something we can use, compare our work to, etc.  With that in mind, using ChAMP to represent important chemical analysis metadata (that researchers would like to search and compare methods with) is a logical use of the platform.

Starting from the ChAMP XML Schema any/all pieces of the schema can be used to create a schema for this application.  Below is an image of the schema for this example.  Remember, standards authors can design this any way they think is appropriate for their application.

[Other links:  ChAMP Standard Method XML Example • ChAMP Referemce Material XML Example]

As you can see, the schema picks only certain elements for the standard.  It shows how to re-purpose existing elements ('champ:description') with a new name ('overview') using the 'substitutionGroup' attribute.  You can also import other schema, if you want a standard to use elements from schema other that ChAMP. Below is what an example XML file might look like representing the metadata about a specific paper.

Alternatively, the links to the ChAMP ontology can be added to the XML file as seen below

Either way, because the ChAMP XML schema is designed with the ontology references included, the metadata items can be crosswalked to the ontology by using the schema.