post.md
In rswipl: Embed 'SWI'-'Prolog'

Modern HTML commonly uses CSS and Javascript. This requires elements in the HTML element or elements in the <body>. Unfortunately this seriously harms re-using HTML DCG rules as components as each of these components may rely on their own style sheets or JavaScript code. We added a `mailing' system to reposition and collect fragments of HTML. This is implemented by html_post//2, html_receive//1 and html_receive//2. <pre><code>* [[html_post//2]] * [[html_receive//1]] * [[html_receive//2]] </code></pre> The library predefines the receiver channel =head= at the end of the =head= element for all pages that write the html =head= through this library. The following code can be used anywhere inside an HTML generating rule to demand a javascript in the header: == js_script(URL) --> html_post(head, script([ src(URL), type('text/javascript') ], [])). == This mechanism is also exploited to add XML namespace (=xmlns=) declarations to the (outer) =html= element using xhml_ns//2: <pre><code>* [[xhtml_ns//2]] </code></pre>