11/6/2022 0 Comments Xmlspy generate xsd from xml![]() To begin with, I generally feel that data is best described in a declarative way. No, it is in the definition of the schema that I dislike SQL. For querying purposes, I don't have a problem with SQL, although it is increasingly common to avoid using raw SQL for queries, and instead to generate it 'behind the scenes', for instance using LINQ to SQL. Once a schema is defined, the database can be populated with data, the data can be retrieved or modified, and so forth. All of these definitions collectively are called the database schema. Similar statements are used for describing default values for columns, indexes, relationships, constraints, and much more besides. This is done in SQL with statements such as these:ĭefinition of a table called 'EXAMPLE_TABLE' with two columns: 'PK' and 'EXAMPLE_COLUMN1' Before data can be added (e.g., the details of a person), a table must be added to contain the data. When a new database is created, it is not only empty of data, but also empty of structure. SQL is commonly used in two distinct ways: as a DDL and for CRUD queries. SQL has a long and distinguished history, and is used by millions of people in all sorts of projects including mine, but this project exists because it has shortcomings that I find frustrating. When I talk about SQL in these articles, I am really referring to Microsoft's version of the language called T-SQL, though other versions of the language could easily be addressed in the future. I use Microsoft SQL Server (usually just known as SQL Server) regularly in a team environment. #Xmlspy generate xsd from xml code#The third and final article will cover a simple approach to code generation and tie up all the loose ends. In the second article, I will focus on creating a code model that maps onto the file format. In this first article, I will describe the background to the project and talk about the development of the file format and an XSD schema. I have assumed a basic understanding of several technologies, but will also provide links and definitions, so hopefully nobody feels excluded. Along the way, I'll share thoughts from the design process and introduce some supporting code libraries which may have applications outside this project. The project has two core outcomes: a new XML file format for describing the schema of a database, and an executable for transforming the new format into SQL. ![]() #Xmlspy generate xsd from xml series#This XSD is great first step – that you then have to take a little bit further.This is the first in a series of three articles describing a project that I undertook to solve a specific problem in my working environment. And with strange handling of the other namespaces, especially the dc:creator element in the namespace. No named types, only elements with nested elements based on nested, anonymous complex type definitions. In the visual editor, the XSD looks like this: I selected the source XML document and had the XSD generated. Next I have used the XML Schema from XML Document option in the New Gallery. A snippet from the document:īook Review: Processing XML Documents with Oracle JDeveloper 11g by Deepak Vohra The example: I have created a source XML document from the RSS feed on this weblog ().I have set the default namespace for this document. Yet it would be comfortable to specify in more detail for which elements to create these enumerations. Of course removing the types we do not need is not a lot of work. Such enumerations are usually required only for a limited number of elements. It does create, when so requested, simpleTypes with enumerations that describe all occurring values in the source XML document. The tool does not create named (complexTypes) – only (nested) elements. The created XSD document does not work well with multiple namespaces – as well will see in this example. ![]() Most XML documents do not represent the entire set of restrictions and freedom that the XSD will describe, so the generated XSD is only a starting point – but a very useful one all the same.Īt this moment, the XML source document has to exist on the file system (we cannot feed the tool with a URL). In short: we can indicate an XML document and have an XSD created that derives its element, type and attribute definitions from the actual XML content in that document. In this article, I will very briefly demonstrate what this functionality allows us to do. Functionality previously found in commercial products such as XMLSpy, that enables us to make a head start with the development of XML Schema Definitions by using an existing XML Document as starting point. While looking into the XML functionality in JDeveloper 11g, you can use the function XML Schema from XML Document. ![]()
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