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问题:

I have a XML input

<field>
  <name>id</name>
  <dataType>string</dataType>
  <maxlength>42</maxlength>
  <required>false</required>
</field>

I am looking for a library or a tool which will take an XML instance document and output a corresponding XSD schema.

I am looking for some java library with which I can generate a XSD for the above XML structure

回答1:

If all you want is an XSD so that the XML you gave conforms to it, you'd be much better off by crafting it yourself rather than using a tool.

No one knows better than you the particularities of the schema, such as which valid values are there (for instance, is the <maxlength> element required? are true and false the only valid values for <required>?).

If you really want to use a tool (I'd only advice using it if you haven't designed the XML and really can't get the real XSD - or if you designed it, double check the generated XSD), you could try Trang. It can infer an XSD Schema from a number of example XML's.

You'll have to take into account that the XSD a tool can infer you might be incomplete or inaccurate if XML samples aren't representative enough.

java -jar trang.jar sampleXML.xml inferredXSD.xsd

You can find a usage example of Trang here.

回答2:

You can try with online tool called XMLGrid: http://xmlgrid.net/xml2xsd.html

回答3:

You could write an XSLT to do something like that. But the problem is, a single document alone is not enough information to generate a schema. Are any of those elements optional? Is there anything missing from that document, that might appear in other instances? How many of a particular element can there be? Do they have to be in that order? There are loads of things that can be expressed in a schema, that are not immediately obvious from one instance of a document that conforms to that schema.

回答4:

For the people who really want to include it in their Java code to generate an XSD and understand the perils, check out Generate XSD from XML programatically in Java