c - DTD validation error with libxml2 -

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i try validate xml data dtd. have use libxml2. produced xml data looks this:

    <?xml version="1.0"?>         <root>             <vent id="1">                 <usb_device_id>1</usb_device_id>                 <usb_device_channel>2</usb_device_channel>                 <vent_box_id>3</vent_box_id>                 <vent_box_channel>4</vent_box_channel>             </vent>        </root>

my dtd looks this: 

    <!element root (vent) >     <!element vent (usb_device_id, usb_channel, vent_box_id, vent_box_channel) >     <!attlist vent id (id) #required >     <!element usb_device_id (cdata) >     <!element usb_channel (cdata) >     <!element vent_box_id (cdata) >

i use http://xmlsoft.org/html/libxml-valid.html#xmlvalidatedtd on parsed tree. setup error message:

element vent: validity error : value "1" attribute id of vent not among enumerated set

where wrong? in advance...

your attribute id defined having type id. means has valid xml name , first character must not digit letter. description can found here or better in w3c documentation itself: id , names (copied form bluepixy's comment)


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