error .dtd file in eclipse rcp galileo

When I want to validate my .dtd file using Eclipse RCP (galileo), it returns the following error:

A '(' character or an element type is required in the declaration of element type "L"

I think the problem is related to the definition of my elements in my .dtd file. Here it is:

<!ELEMENT experiment (L,T,P,I,expl_vars,resp_vars)>
<!ATTLIST experiment exp_id CDATA "">
<!ELEMENT L (#CDATA)>
<!ELEMENT T (#CDATA)>
<!ELEMENT P (#CDATA)>
<!ELEMENT I (#CDATA)>
<!ELEMENT expl_vars (variable+)>
<!ELEMENT resp_vars (variable+)>
<!ELEMENT variable (flow_rate)>
<!ATTLIST variable var_id CDATA "">
<!ELEMENT flow_rate (#CDATA)>

Could somebody point out where my mistake is situated? Or is this error perhaps a bug in Eclipse RCP (which I heavily doubt)?

thanks in advance

You can check if validation is turned on :

Eclipse => Window (menu) => Preferences => Validation => DTD Validator

U can use online validators too, for DTD just paste your code there

Are you sure u want to use DTD ? Why not Schema instead?

I don't know what you want to do but if you replace in your code
CDATA with PCDATA you will get not validation error
and you will be able to create a valid XML doc from it.

regards

FON,

thanks for the help!

Changing the element content from #CDATA to #PCDATA solved the errors. Any idea what the underlying reason is for this error?

While being very new in using XML I indeed read that .DTD files are 'old-fashioned' compared to XML Schema's. However, building this .DTD for me was straight-forward, fast and will serve a non-web application. Therefore I was quite pragmatic and satisfied with this format.

kind regards,