Support Relative URLs for remote wsdl's

[nickw444]

Running the tool over the ONVIF specification produces the following error:

2017/12/02 17:44:05 wsdl import: could not open file raw:  path: ../../../ver10/schema/onvif.xsd escaped: ../../../ver10/schema/onvif.xsd : open ../../../ver10/schema/onvif.xsd: no such file or directory

Upon closer inspection of the WSDL, it appears it does some relative importing:

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" href="../../../ver20/util/onvif-wsdl-viewer.xsl"?>
<!--
Copyright (c) 2008-2017 by ONVIF: Open Network Video Interface Forum. All rights reserved.

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THIS DOCUMENT IS PROVIDED "AS IS," AND THE CORPORATION AND ITS MEMBERS AND THEIR AFFILIATES, MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR TITLE; THAT THE CONTENTS OF THIS DOCUMENT ARE SUITABLE FOR ANY PURPOSE; OR THAT THE IMPLEMENTATION OF SUCH CONTENTS WILL NOT INFRINGE ANY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
IN NO EVENT WILL THE CORPORATION OR ITS MEMBERS OR THEIR AFFILIATES BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL DAMAGES, ARISING OUT OF OR RELATING TO ANY USE OR DISTRIBUTION OF THIS DOCUMENT, WHETHER OR NOT (1) THE CORPORATION, MEMBERS OR THEIR AFFILIATES HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR (2) SUCH DAMAGES WERE REASONABLY FORESEEABLE, AND ARISING OUT OF OR RELATING TO ANY USE OR DISTRIBUTION OF THIS DOCUMENT.  THE FOREGOING DISCLAIMER AND LIMITATION ON LIABILITY DO NOT APPLY TO, INVALIDATE, OR LIMIT REPRESENTATIONS AND WARRANTIES MADE BY THE MEMBERS AND THEIR RESPECTIVE AFFILIATES TO THE CORPORATION AND OTHER MEMBERS IN CERTAIN WRITTEN POLICIES OF THE CORPORATION.
-->
<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tds="http://www.onvif.org/ver10/device/wsdl" targetNamespace="http://www.onvif.org/ver10/device/wsdl">
	<wsdl:types>
		<xs:schema targetNamespace="http://www.onvif.org/ver10/device/wsdl" xmlns:tt="http://www.onvif.org/ver10/schema" xmlns:tds="http://www.onvif.org/ver10/device/wsdl" elementFormDefault="qualified" version="17.06">
			<xs:import namespace="http://www.onvif.org/ver10/schema" schemaLocation="../../../ver10/schema/onvif.xsd"/>
			<!--===============================-->

[fiorix]

Seems legit. We definitely need to be able to handle relative paths. I'm happy to review any code from pull requests, or do it myself whenever time permits.

[fiorix]

Public examples in #82.

[fiorix]

stale, closing

[m-d-johnson]

I'm still seeing this, sadly.

[ikingye]

still error

[fiorix]

Happy to reopen if someone is willing to send a PR. I honestly cannot work on it atm.