Which two of the following statements are differences between semi-structured data model (such as JSON or...

 

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Which two of the following statements are differences between semi-structured data model (such as JSON or XML) and the relational data model? Select all that apply. Unstructured text data must be first transformed into semi-structured data before it can be analysed; the relational data model does not help in this case. The relational data model needs to specify a schema first, while semi- structured data is self-describing and hence can be parsed without a priori knowing the data's structure. The relational data model is based on relations (sets) of homogeneous tuples, while XML or JSON can represent data with tree-like, nested structures. The relational data model is semi-structured (it supports NULL values), while XML or JSON have a rigidly structured data model. In the relational data model, every attribute must have a name and type, while in XML or JSON, data values can be given without any meta-data or even name. Which two of the following statements are differences between semi-structured data model (such as JSON or XML) and the relational data model? Select all that apply. Unstructured text data must be first transformed into semi-structured data before it can be analysed; the relational data model does not help in this case. The relational data model needs to specify a schema first, while semi- structured data is self-describing and hence can be parsed without a priori knowing the data's structure. The relational data model is based on relations (sets) of homogeneous tuples, while XML or JSON can represent data with tree-like, nested structures. The relational data model is semi-structured (it supports NULL values), while XML or JSON have a rigidly structured data model. In the relational data model, every attribute must have a name and type, while in XML or JSON, data values can be given without any meta-data or even name.

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