Material tags are optional. They can be useful to underline the
context of a sniplink. Three types of tags are possible: class tags,
property tags and application tags. For each type, a maximum of three
tags, separated by commata, can be given. A single tag may not exceed
32 characters.
Material class tag. A class tag classifies [sic] your material
by giving a generic name or technical term. The name may relate to
chemical classification, composition or structure; for example
rare earth element, metal oxide or polyhalogen anion. Broad
classification terms such as mineral, zeolite, or ceramic also
are a good choice. Further, a tag may be role-defining, such
as dopant or inclusion.
Material property tag. A material property tag should only
be supplied, if it refers to a property or behavior mentioned in
the snippet. For example, if the snippet refers to the
thermal decomposition of the material, the tag thermal stability
(or a repetition of the term thermal decomposition) makes sense.
For snippet with a reference to median lethal dose, the tag acute
toxicity is appropriate. Notice, that tags are supposed to relate
and annotate the snippet; not the resource, the sniplink links to.
Material application tag. A material application tag
hints to applications of a material. Again, the tag should derive
from what information is given in the snippet. If this
describes the chemical reactivity of the material, the tag
catalyst may apply. Another example: the tag hydrogen storage
should only be given, if the snippet content is about this subject.
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