Using the uni-level description (ULD) to support data-model interoperability

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Authors: Lois Delcambre, Shawn Bowers

Tags: 2005, conceptual modeling

We describe a framework called the Uni-Level Description (ULD) for accurately representing information from a broad range of data models. The ULD extends previous meta-data-model approaches by: (a) providing uniform representation and access to data model, schema, and data, and (b) supporting data models with non-traditional schema arrangements, including those that allow optional and multiple levels of schema. Because the ULD is a flat, first-order representation, we show how Datalog over the ULD can provide a flexible mechanism to query, extract, and transform information from data sources that exhibit various types of structural heterogeneity.

Read the full paper here: https://pdf.sciencedirectassets.com/271546/1-s2.0-S0169023X06X01817/1-s2.0-S0169023X05001667/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEBgaCXVzLWVhc3QtMSJHMEUCIElQ4yAUDvdzZnPYPoQtG9%2Fij5NpaJE9ziiLKwrd%2B0DJAiEAqnHywY84fymcU3LwHZdzDChEQqYbRSTd%2B4UqrxrFXK0qtAMIMRADGgwwNTkwMDM1NDY4NjUiDI93W%2FrP%2B9NfCtcd8yqRA3MRbntkdaDath2Sd3tjjXkkLORvalalp1hF7%2B7%2Fn7bUMK9RK%2BNPF9a2wWhc%2B8m2gDvtTcFg1JJFkFLGxLQjjraXzqFgXZ5vn7mihQmH0nw5tuGex2WJMP0K3z3Fb%2B8xqBvALnJ7LDOdVYTdQ%2FYb44yLDUospr4cTxf6AZ%2FH%2BgAea7JGzbuJBahfhmbfjf6j0ZPoZ83sx4k7%2FvYAZ8%2B0TzPa%2FpSh%2BzEiYviorH9j8FbxfU9yo0Vk7We6h9fQrDuKvqh52Q4ixdZ9lAO30L7R8dxrjwozzIWywJXWX%2BGjWGj6oZNfFld%2BAGEIyu85j857f2LC6VQSR4PM%2BvY6ILvHotGsGUNqfZxgaerN6KGwqm%2BnTY2tqk8LO0HapF1fl2ZLJ22HMKL6dYEnC5VrJUAE7t61p%2Bt6hEGCqLm1czacNGjaE3t6q8Zme%2BaOp1AHhxmGDWk7yyJvq4jxY1TgHM%2FF%2Fi7yX8jsUCdGjEpRr8Vszv5aa51pGecPRmT0pzw2qQGNtLG%2Br5Puwim%2B5qcCOZWPBF0mMJCrk%2FsFOusBrln%2FqgMLQzficHh2qjRqekTPp1Sv26GP70EIrdvjGkBwP7lIhq3FC6ANJV0QudGbBAsLsyd1nkXFgMgNU5d6fn9ChvhH2kr7p9tgMG0%2Fy%2F5WnErOuMULbxoAYsjGU9ymuZOjvB9B0kFR5bd8Arj13dAvHrTx3dhnVQ6jKucbbqBwwigamvVHl69ezhIKMeSTTigWDjlIiDvDkkN8oAyEPHJ%2FBjXAQ86AJJEuRzfw1U9C74wzIx%2FAfJYh6KMIMfbWfldtH6XDMOm3Q5QQv6J%2Fp2wcUVwYh9i2cvvR%2Bol61IDghPJCbrXWL8h10A%3D%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20200918T162243Z&X-Amz-SignedHeaders=host&X-Amz-Expires=300&X-Amz-Credential=ASIAQ3PHCVTYSO4LHY76%2F20200918%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=161104b009c46fe3af644a322f642c7bdb68da71900db72f7ed946aaea526f5f&hash=78f259ecb24d69a3e15fd1f7c88daa950cea609bc1fe6bf075119c93fe760f35&host=68042c943591013ac2b2430a89b270f6af2c76d8dfd086a07176afe7c76c2c61&pii=S0169023X05001667&tid=spdf-0ab082cc-6af8-46f2-a5a3-825be25d866c&sid=ce3e6b217906524963386c21db5fa5ebfaccgxrqa&type=client