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The authors used a voxel paradigm , rather than the traditional volume boundary representation via B-rep , to represent lattices and employed an iso-value matrix , similar to , for functional grading .
 concept or principle: voxel; concept or principle: volume; concept or principle: boundary representation; enabling technology: B-rep; concept or principle: lattices
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: voxel; concept or principle: volume; concept or principle: boundary representation; enabling technology: B-rep; concept or principle: lattices