.BEM specifiers for J1 Template __variables__
[cols="1a,3a,8a", options="header", width="100%", role="rtable mt-3"]
|===============================================================================
|Specifier |Example |Description

|Block
|`url` \| `image` \| `data`
|Top level specifier. Defines the (global) resource type, e.g. an URL, image
or a dataset

|Element
|`url-j1`
|Specifier to express the dependency upon the block, e.g. a site prefix like
`https://jekyll.one`

|Modifier
|`url-j1\--home` \| `url-j1\--learn_present_images`
|Specifier that adresses a specific source: e.g. web page like
`https://jekyll.one/` \| `https://jekyll.one/pages/public/learn/roundtrip/present_images`

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