<!ELEMENT backends (backend*)>
<!ELEMENT backends (backend)*>
<!ELEMENT backend (instances|class|max-concurrent-requests|options)*>
<!ELEMENT instances (#PCDATA)>
<!ELEMENT class (#PCDATA)>
<!ELEMENT max-concurrent-requests (#PCDATA)>
<!ELEMENT options (fail-fast|dynamic|public)*>
<!ELEMENT fail-fast (#PCDATA)>
<!ELEMENT dynamic (#PCDATA)>
<!ELEMENT public (#PCDATA)>
