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The philosophy of ubiquitous language Karl van Heijster www.karlvanheijster.com
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Domain-Driven Design & Ludwig Wittgenstein Karl van Heijster www.karlvanheijster.com
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Software craftsman Philosopher DDD amateur www.karlvanheijster.com Karl van Heijster
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Object Module Module Module Module
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Product - Id - Name - Description - Price - Cost - Quantity Catalog Sales Purchasing Warehouse
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Product - Id - Name - Description - Price - Cost - Quantity Catalog Sales Purchasing Warehouse
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Product - Id - Name - Description - Price - Cost - Quantity Catalog Sales Purchasing Warehouse
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Product - Id - Name - Description - Price - Cost - Quantity Catalog Sales Purchasing Warehouse
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Product - Id - Name - Description - Price - Cost - Quantity Catalog Sales Purchasing Warehouse
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SalesProduct - Id - Price Catalog Sales Purchasing Warehouse PurchasingProduct - Id - Cost WarehouseProduct - Id - Quantity CatalogProduct - Id - Name - Description
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“The cat is on the mat”
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“The cat is on the mat”
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“The cat is on the mat”
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“The cat is on the mat”
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“The cat is on the mat” true
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“The cat is on the mat” false
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aRb cat.IsOn(mat);
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“The present king of France is bald”
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aRb
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aRb presentKingOfFrance.IsBald
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∃x((Kx ∧ ∀y(Ky → y = x)) ∧ Bx) x is not null && x.IsKing && y.All(y => y.IsKing ? y == x : true) && x.IsBald;
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SalesProduct - Id - Price Catalog Sales Purchasing Warehouse PurchasingProduct - Id - Cost WarehouseProduct - Id - Quantity CatalogProduct - Id - Name - Description
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“The cat is on the mat” • Help me find my cat • Describe the contents of a picture • Use coded language, “The eagle has landed” • Rhyming
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SalesProduct - Id - Price Catalog Sales Purchasing Warehouse PurchasingProduct - Id - Cost WarehouseProduct - Id - Quantity CatalogProduct - Id - Name - Description
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Product - Id - Price Catalog Sales Purchasing Warehouse Product - Id - Cost Product - Id - Quantity Product - Id - Name - Description
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Product - Id - Price Catalog Sales Purchasing Warehouse Product - Id - Cost Product - Id - Quantity Product - Id - Name - Description
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The philosophy of ubiquitous language Karl van Heijster www.karlvanheijster.com