| 摘要 |
Methods and apparatus, including computer systems and program products, that implement a description language and a parser for a description language. A method includes receiving input including a specification of base items, a specification of contexts, and a specification of a selected context from the contexts. The method further includes generating an output set of items by evaluating the selected context. In that method, each item in the output set of items includes core attributes of a corresponding base item and can include attributes from a context. Generating an output set of items can include generating a specific bill of materials.
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