Defining hierarchical attributes

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How it's to define hierarchical attributes in XML. In fact, I mean how to define attributes in such a way that wherever a specific attributes used, another one(s) could be used. For example, att1 could not be used before att2 and in every case that att1 is used, att2 is allowed.
Something like this:

XML

<elem att1="x" att2="y"/>:  is true

<elem att1="x" />:  is true

<elem  att2="y"/>: is not true

Posted 5-Feb-15 19:00pm

Eilia98

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Comments

Kenneth Haugland 6-Feb-15 1:05am

In my mind, hierarchical attributes does not look like that:
<elem name="A">
<elem att1="x">
<elem att2="y">

Eilia98 6-Feb-15 1:28am

Maybe I misused hierarchical term; however I'm looking forward for the mentioned functionality. Any idea?

Richard MacCutchan 6-Feb-15 4:34am

Attributes are linear not hierarchical. What problem are you actually trying to solve?

Eilia98 6-Feb-15 8:05am

Maybe it is better to name them conditional attributes.I want to define attributes in such a way that wherever a specific attributes used, another one(s) could be used. Such as example presented in the question. In fact, I want to set order for attributes. Is there any way to do that?

Richard MacCutchan 6-Feb-15 8:52am

That does not really make sense. XML is just text, it has no intrinsic meaning. You need to define the rules for your XML data, and then write the code to manage or interpret it.

John C Rayan 7-Feb-15 3:44am

You cannot achieve your goal without XSD and validation

Eilia98 8-Feb-15 0:54am

How it's possible using XSD? Any example please.

John C Rayan 8-Feb-15 5:05am

I assume that att1 is always required. If that's the case then in your xsd define att1 as "use=required" and att2 as "use=optional". You need to go through XSD understand these.

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