XSLT evaluate attribute value as XPath?

Question

I have this input line in XSLT:

<input type="text" id="CSEMissingInput" class="CSEMissingInput"
       onblur="SetSeriesAnswer(this)" placeholder="[[MManswerInputPlaceholder]]" 
       **maxlength= "SCHEME/FIELD[@id='charactersLimitation']"**>
</input>`

When I put a number in the maxlength it works just fine, but when try to obtain that number programmatically, it doesn't work. How can I fix this?

Answer 1

Use an Attribute Value Template ,

maxlength= "{SCHEME/FIELD[@id='charactersLimitation']}"

in order for the attribute value string to be interpreted as an XPath.